Software / code / prosody
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core/s2smanager.lua @ 960:6bc16062da6c
core.s2smanager: Check for valid host and port before attempting connection
| author | Matthew Wild <mwild1@gmail.com> |
|---|---|
| date | Mon, 06 Apr 2009 23:43:48 +0100 |
| parent | 959:e3db909065f2 |
| child | 963:43b140edfd84 |
| 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; |
| 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; |
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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 |
| 337 | 39 local dns = require "net.dns"; |
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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("debug", "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 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 if not host_session.conn then destroy_session(host_session); end |
| 148 | 109 end |
| 110 end | |
| 111 | |
| 112 local open_sessions = 0; | |
| 113 | |
| 114 function new_incoming(conn) | |
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115 local session = { conn = conn, type = "s2sin_unauthed", direction = "incoming", hosts = {} }; |
| 148 | 116 if true then |
| 117 session.trace = newproxy(true); | |
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118 getmetatable(session.trace).__gc = function () open_sessions = open_sessions - 1; end; |
| 148 | 119 end |
| 120 open_sessions = open_sessions + 1; | |
| 343 | 121 local w, log = conn.write, logger_init("s2sin"..tostring(conn):match("[a-f0-9]+$")); |
| 122 session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end | |
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123 incoming_s2s[session] = true; |
| 148 | 124 return session; |
| 125 end | |
| 126 | |
| 127 function new_outgoing(from_host, to_host) | |
| 128 local host_session = { to_host = to_host, from_host = from_host, notopen = true, type = "s2sout_unauthed", direction = "outgoing" }; | |
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129 hosts[from_host].s2sout[to_host] = host_session; |
| 148 | 130 |
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131 local log; |
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132 do |
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133 local conn_name = "s2sout"..tostring(host_session):match("[a-f0-9]*$"); |
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134 log = logger_init(conn_name); |
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135 host_session.log = log; |
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136 end |
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137 |
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138 attempt_connection(host_session); |
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139 |
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140 return host_session; |
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141 end |
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142 |
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143 |
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144 function attempt_connection(host_session, err) |
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145 local from_host, to_host = host_session.from_host, host_session.to_host; |
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146 local conn, handler = socket.tcp() |
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147 |
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148 local connect_host, connect_port = idna_to_ascii(to_host), 5269; |
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149 |
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150 if not err then -- This is our first attempt |
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151 local answer = dns.lookup("_xmpp-server._tcp."..connect_host..".", "SRV"); |
| 337 | 152 |
| 153 if answer then | |
| 154 log("debug", to_host.." has SRV records, handling..."); | |
| 155 local srv_hosts = {}; | |
| 156 host_session.srv_hosts = srv_hosts; | |
| 157 for _, record in ipairs(answer) do | |
| 158 t_insert(srv_hosts, record.srv); | |
| 159 end | |
| 160 t_sort(srv_hosts, compare_srv_priorities); | |
| 161 | |
| 162 local srv_choice = srv_hosts[1]; | |
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163 host_session.srv_choice = 1; |
| 337 | 164 if srv_choice then |
| 165 connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port; | |
| 166 log("debug", "Best record found, will connect to %s:%d", connect_host, connect_port); | |
| 167 end | |
| 168 end | |
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169 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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170 host_session.srv_choice = host_session.srv_choice + 1; |
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171 local srv_choice = host_session.srv_hosts[host_session.srv_choice]; |
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172 connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port; |
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173 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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174 else |
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175 host_session.log("debug", "Out of connection options, can't connect to %s", tostring(host_session.to_host)); |
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176 -- We're out of options |
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177 return false; |
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178 end |
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179 |
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180 if not (connect_host and connect_port) then |
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181 -- Likely we couldn't resolve DNS |
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182 return false; |
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183 end |
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184 |
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185 -- Ok, we're going to try to connect |
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186 conn:settimeout(0); |
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187 local success, err = conn:connect(connect_host, connect_port); |
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188 if not success and err ~= "timeout" then |
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189 log("warn", "s2s connect() failed: %s", err); |
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190 return false; |
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191 end |
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192 |
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193 local cl = connlisteners_get("xmppserver"); |
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194 conn = wrapclient(conn, connect_host, connect_port, cl, cl.default_mode or 1, hosts[from_host].ssl_ctx, false ); |
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195 host_session.conn = conn; |
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196 |
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197 -- Register this outgoing connection so that xmppserver_listener knows about it |
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198 -- otherwise it will assume it is a new incoming connection |
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199 cl.register_outgoing(conn, host_session); |
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200 |
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201 local w = conn.write; |
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202 host_session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end |
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203 |
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204 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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205 return true; |
| 148 | 206 end |
| 207 | |
| 208 function streamopened(session, attr) | |
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209 local send = session.sends2s; |
| 148 | 210 |
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211 -- TODO: #29: SASL/TLS on s2s streams |
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212 session.version = 0; --tonumber(attr.version) or 0; |
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213 |
| 148 | 214 if session.version >= 1.0 and not (attr.to and attr.from) then |
| 215 log("warn", (session.to_host or "(unknown)").." failed to specify 'to' or 'from' hostname as per RFC"); | |
| 216 end | |
| 217 | |
| 218 if session.direction == "incoming" then | |
| 219 -- Send a reply stream header | |
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220 session.to_host = attr.to and nameprep(attr.to); |
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221 session.from_host = attr.from and nameprep(attr.from); |
| 148 | 222 |
| 223 session.streamid = uuid_gen(); | |
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224 (session.log or log)("debug", "incoming s2s received <stream:stream>"); |
| 148 | 225 send("<?xml version='1.0'?>"); |
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226 send(stanza("stream:stream", { xmlns='jabber:server', ["xmlns:db"]='jabber:server:dialback', |
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227 ["xmlns:stream"]='http://etherx.jabber.org/streams', id=session.streamid, from=session.to_host }):top_tag()); |
| 331 | 228 if session.to_host and not hosts[session.to_host] then |
| 229 -- Attempting to connect to a host we don't serve | |
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230 session:close({ condition = "host-unknown"; text = "This host does not serve "..session.to_host }); |
| 331 | 231 return; |
| 232 end | |
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233 if session.version >= 1.0 then |
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234 send(st.stanza("stream:features") |
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235 :tag("dialback", { xmlns='urn:xmpp:features:dialback' }):tag("optional"):up():up()); |
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236 end |
| 148 | 237 elseif session.direction == "outgoing" then |
| 238 -- If we are just using the connection for verifying dialback keys, we won't try and auth it | |
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239 if not attr.id then error("stream response did not give us a streamid!!!"); end |
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240 session.streamid = attr.id; |
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241 |
| 148 | 242 if not session.dialback_verifying then |
|
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243 initiate_dialback(session); |
| 148 | 244 else |
| 245 mark_connected(session); | |
| 246 end | |
| 247 end | |
| 259 | 248 |
| 148 | 249 session.notopen = nil; |
| 250 end | |
| 251 | |
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252 function streamclosed(session) |
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253 session.send("</stream:stream>"); |
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254 session.notopen = true; |
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255 end |
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256 |
|
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257 function initiate_dialback(session) |
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258 -- generate dialback key |
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259 session.dialback_key = generate_dialback(session.streamid, session.to_host, session.from_host); |
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260 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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261 session.log("info", "sent dialback key on outgoing s2s stream"); |
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262 end |
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263 |
| 148 | 264 function generate_dialback(id, to, from) |
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265 return sha256_hash(id..to..from..dialback_secret, true); |
| 148 | 266 end |
| 267 | |
| 268 function verify_dialback(id, to, from, key) | |
| 269 return key == generate_dialback(id, to, from); | |
| 270 end | |
| 271 | |
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272 function make_authenticated(session, host) |
| 148 | 273 if session.type == "s2sout_unauthed" then |
| 274 session.type = "s2sout"; | |
| 275 elseif session.type == "s2sin_unauthed" then | |
| 276 session.type = "s2sin"; | |
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277 if host then |
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278 session.hosts[host].authed = true; |
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279 end |
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280 elseif session.type == "s2sin" and host then |
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281 session.hosts[host].authed = true; |
| 148 | 282 else |
| 283 return false; | |
| 284 end | |
| 285 session.log("info", "connection is now authenticated"); | |
| 286 | |
| 287 mark_connected(session); | |
| 288 | |
| 289 return true; | |
| 290 end | |
| 291 | |
| 292 function mark_connected(session) | |
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293 local sendq, send = session.sendq, session.sends2s; |
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294 |
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295 local from, to = session.from_host, session.to_host; |
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296 |
|
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297 session.log("debug", session.direction.." s2s connection "..from.."->"..to.." is now complete"); |
|
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298 |
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299 local send_to_host = send_to_host; |
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300 function session.send(data) send_to_host(to, from, data); end |
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301 |
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302 |
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303 if session.direction == "outgoing" then |
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304 if sendq then |
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305 session.log("debug", "sending "..#sendq.." queued stanzas across new outgoing connection to "..session.to_host); |
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306 for i, data in ipairs(sendq) do |
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307 send(data[1]); |
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308 sendq[i] = nil; |
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309 end |
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310 session.sendq = nil; |
| 148 | 311 end |
| 312 end | |
| 313 end | |
| 314 | |
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315 function destroy_session(session) |
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316 (session.log or log)("info", "Destroying "..tostring(session.direction).." session "..tostring(session.from_host).."->"..tostring(session.to_host)); |
| 331 | 317 |
| 318 | |
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319 if session.direction == "outgoing" then |
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320 hosts[session.from_host].s2sout[session.to_host] = nil; |
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321 bounce_sendq(session); |
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322 elseif session.direction == "incoming" then |
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323 incoming_s2s[session] = nil; |
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324 end |
| 331 | 325 |
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326 for k in pairs(session) do |
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327 if k ~= "trace" then |
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328 session[k] = nil; |
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329 end |
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330 end |
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331 end |
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332 |
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Just committing this warning, because I want to know if the problem really affects us
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333 return _M; |
