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core/s2smanager.lua @ 631:6957fe7b0313
Bounce stanza errors on failed s2s
| author | Waqas Hussain <waqas20@gmail.com> |
|---|---|
| date | Fri, 19 Dec 2008 01:57:13 +0500 |
| parent | 621:cd2cab5400fc |
| child | 739:1def06cd9311 |
| rev | line source |
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| 615 | 1 -- Prosody IM v0.2 |
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2 -- Copyright (C) 2008 Matthew Wild |
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3 -- Copyright (C) 2008 Waqas Hussain |
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4 -- |
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5 -- This program is free software; you can redistribute it and/or |
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6 -- modify it under the terms of the GNU General Public License |
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7 -- as published by the Free Software Foundation; either version 2 |
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8 -- of the License, or (at your option) any later version. |
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9 -- |
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10 -- This program is distributed in the hope that it will be useful, |
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11 -- but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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13 -- GNU General Public License for more details. |
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14 -- |
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15 -- You should have received a copy of the GNU General Public License |
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16 -- along with this program; if not, write to the Free Software |
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17 -- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
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18 -- |
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19 |
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20 |
| 148 | 21 |
| 22 local hosts = hosts; | |
| 23 local sessions = sessions; | |
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24 local core_process_stanza = function(a, b) core_process_stanza(a, b); end |
| 148 | 25 local socket = require "socket"; |
| 26 local format = string.format; | |
| 337 | 27 local t_insert, t_sort = table.insert, table.sort; |
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28 local get_traceback = debug.traceback; |
| 148 | 29 local tostring, pairs, ipairs, getmetatable, print, newproxy, error, tonumber |
| 30 = tostring, pairs, ipairs, getmetatable, print, newproxy, error, tonumber; | |
| 31 | |
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32 local idna_to_ascii = require "util.encodings".idna.to_ascii; |
| 148 | 33 local connlisteners_get = require "net.connlisteners".get; |
| 34 local wraptlsclient = require "net.server".wraptlsclient; | |
| 35 local modulemanager = require "core.modulemanager"; | |
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36 local st = require "stanza"; |
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37 local stanza = st.stanza; |
| 148 | 38 |
| 39 local uuid_gen = require "util.uuid".generate; | |
| 40 | |
| 41 local logger_init = require "util.logger".init; | |
| 42 | |
| 43 local log = logger_init("s2smanager"); | |
| 44 | |
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45 local sha256_hash = require "util.hashes".sha256; |
| 148 | 46 |
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47 local dialback_secret = sha256_hash(tostring{} .. math.random() .. socket.gettime(), true); |
| 148 | 48 |
| 337 | 49 local dns = require "net.dns"; |
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50 |
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51 incoming_s2s = {}; |
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52 local incoming_s2s = incoming_s2s; |
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53 |
| 148 | 54 module "s2smanager" |
| 55 | |
| 337 | 56 local function compare_srv_priorities(a,b) return a.priority < b.priority or a.weight < b.weight; end |
| 57 | |
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58 local function bounce_sendq(session) |
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59 local sendq = session.sendq; |
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60 if sendq then |
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61 session.log("debug", "sending error replies for "..#sendq.." queued stanzas because of failed outgoing connection to "..tostring(session.to_host)); |
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62 local dummy = { |
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63 type = "s2sin"; |
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64 send = function(s) |
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65 (session.log or log)("error", "Replying to to an s2s error reply, please report this! Traceback: %s", get_traceback()); |
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66 end; |
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67 dummy = true; |
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68 }; |
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69 for i, data in ipairs(sendq) do |
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70 local reply = data[2]; |
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71 local xmlns = reply.attr.xmlns; |
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72 if not xmlns or xmlns == "jabber:client" or xmlns == "jabber:server" then |
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73 reply.attr.type = "error"; |
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74 reply:tag("error", {type = "cancel"}) |
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75 :tag("remote-server-not-found", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"}):up(); |
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76 core_process_stanza(dummy, reply); |
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77 end |
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78 sendq[i] = nil; |
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79 end |
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80 session.sendq = nil; |
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81 end |
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82 end |
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83 |
| 148 | 84 function send_to_host(from_host, to_host, data) |
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85 local host = hosts[from_host].s2sout[to_host]; |
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86 if host then |
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87 -- We have a connection to this host already |
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88 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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89 (host.log or log)("debug", "trying to send over unauthed s2sout to "..to_host); |
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90 if not host.notopen and not host.dialback_key then |
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91 host.log("debug", "dialback had not been initiated"); |
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92 initiate_dialback(host); |
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93 end |
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94 |
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95 -- Queue stanza until we are able to send it |
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96 if host.sendq then t_insert(host.sendq, {tostring(data), st.reply(data)}); |
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97 else host.sendq = { {tostring(data), st.reply(data)} }; end |
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98 host.log("debug", "stanza [%s] queued ", data.name); |
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99 elseif host.type == "local" or host.type == "component" then |
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100 log("error", "Trying to send a stanza to ourselves??") |
| 256 | 101 log("error", "Traceback: %s", get_traceback()); |
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102 log("error", "Stanza: %s", tostring(data)); |
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103 else |
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104 (host.log or log)("debug", "going to send stanza to "..to_host.." from "..from_host); |
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105 -- FIXME |
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106 if host.from_host ~= from_host then |
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107 log("error", "WARNING! This might, possibly, be a bug, but it might not..."); |
| 331 | 108 log("error", "We are going to send from %s instead of %s", tostring(host.from_host), tostring(from_host)); |
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109 end |
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110 host.sends2s(data); |
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111 host.log("debug", "stanza sent over "..host.type); |
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112 end |
| 148 | 113 else |
| 114 log("debug", "opening a new outgoing connection for this stanza"); | |
| 115 local host_session = new_outgoing(from_host, to_host); | |
| 116 -- Store in buffer | |
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117 host_session.sendq = { {tostring(data), st.reply(data)} }; |
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118 if not host_session.conn then destroy_session(host_session); end |
| 148 | 119 end |
| 120 end | |
| 121 | |
| 122 local open_sessions = 0; | |
| 123 | |
| 124 function new_incoming(conn) | |
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125 local session = { conn = conn, type = "s2sin_unauthed", direction = "incoming", hosts = {} }; |
| 148 | 126 if true then |
| 127 session.trace = newproxy(true); | |
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128 getmetatable(session.trace).__gc = function () open_sessions = open_sessions - 1; end; |
| 148 | 129 end |
| 130 open_sessions = open_sessions + 1; | |
| 343 | 131 local w, log = conn.write, logger_init("s2sin"..tostring(conn):match("[a-f0-9]+$")); |
| 132 session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end | |
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133 incoming_s2s[session] = true; |
| 148 | 134 return session; |
| 135 end | |
| 136 | |
| 137 function new_outgoing(from_host, to_host) | |
| 138 local host_session = { to_host = to_host, from_host = from_host, notopen = true, type = "s2sout_unauthed", direction = "outgoing" }; | |
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139 hosts[from_host].s2sout[to_host] = host_session; |
| 148 | 140 |
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141 local log; |
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142 do |
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143 local conn_name = "s2sout"..tostring(host_session):match("[a-f0-9]*$"); |
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144 log = logger_init(conn_name); |
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145 host_session.log = log; |
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146 end |
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147 |
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148 attempt_connection(host_session); |
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149 |
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150 return host_session; |
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151 end |
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152 |
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153 |
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154 function attempt_connection(host_session, err) |
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155 local from_host, to_host = host_session.from_host, host_session.to_host; |
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156 local conn, handler = socket.tcp() |
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157 |
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158 local connect_host, connect_port = idna_to_ascii(to_host), 5269; |
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159 |
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160 if not err then -- This is our first attempt |
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161 local answer = dns.lookup("_xmpp-server._tcp."..connect_host..".", "SRV"); |
| 337 | 162 |
| 163 if answer then | |
| 164 log("debug", to_host.." has SRV records, handling..."); | |
| 165 local srv_hosts = {}; | |
| 166 host_session.srv_hosts = srv_hosts; | |
| 167 for _, record in ipairs(answer) do | |
| 168 t_insert(srv_hosts, record.srv); | |
| 169 end | |
| 170 t_sort(srv_hosts, compare_srv_priorities); | |
| 171 | |
| 172 local srv_choice = srv_hosts[1]; | |
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173 host_session.srv_choice = 1; |
| 337 | 174 if srv_choice then |
| 175 connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port; | |
| 176 log("debug", "Best record found, will connect to %s:%d", connect_host, connect_port); | |
| 177 end | |
| 178 end | |
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179 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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180 host_session.srv_choice = host_session.srv_choice + 1; |
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181 local srv_choice = host_session.srv_hosts[host_session.srv_choice]; |
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182 connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port; |
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183 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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184 else |
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185 host_session.log("debug", "Out of connection options, can't connect to %s", tostring(host_session.to_host)); |
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186 -- We're out of options |
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187 return false; |
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188 end |
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189 |
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190 -- Ok, we're going to try to connect |
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191 conn:settimeout(0); |
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192 local success, err = conn:connect(connect_host, connect_port); |
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193 if not success and err ~= "timeout" then |
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194 log("warn", "s2s connect() failed: %s", err); |
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195 return false; |
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196 end |
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197 |
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198 local cl = connlisteners_get("xmppserver"); |
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199 conn = wraptlsclient(cl, conn, connect_host, connect_port, 0, cl.default_mode or 1, hosts[from_host].ssl_ctx ); |
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200 host_session.conn = conn; |
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201 |
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202 -- Register this outgoing connection so that xmppserver_listener knows about it |
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203 -- otherwise it will assume it is a new incoming connection |
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204 cl.register_outgoing(conn, host_session); |
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205 |
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206 local w = conn.write; |
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207 host_session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end |
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208 |
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209 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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210 return true; |
| 148 | 211 end |
| 212 | |
| 213 function streamopened(session, attr) | |
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214 local send = session.sends2s; |
| 148 | 215 |
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216 -- TODO: #29: SASL/TLS on s2s streams |
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217 session.version = 0; --tonumber(attr.version) or 0; |
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218 |
| 148 | 219 if session.version >= 1.0 and not (attr.to and attr.from) then |
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220 --print("to: "..tostring(attr.to).." from: "..tostring(attr.from)); |
| 148 | 221 log("warn", (session.to_host or "(unknown)").." failed to specify 'to' or 'from' hostname as per RFC"); |
| 222 end | |
| 223 | |
| 224 if session.direction == "incoming" then | |
| 225 -- Send a reply stream header | |
| 226 | |
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227 --for k,v in pairs(attr) do print("", tostring(k), ":::", tostring(v)); end |
| 148 | 228 |
| 229 session.to_host = attr.to; | |
| 230 session.from_host = attr.from; | |
| 231 | |
| 232 session.streamid = uuid_gen(); | |
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233 (session.log or log)("debug", "incoming s2s received <stream:stream>"); |
| 148 | 234 send("<?xml version='1.0'?>"); |
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235 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 | 236 if session.to_host and not hosts[session.to_host] then |
| 237 -- Attempting to connect to a host we don't serve | |
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238 session:close({ condition = "host-unknown"; text = "This host does not serve "..session.to_host }); |
| 331 | 239 return; |
| 240 end | |
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241 if session.version >= 1.0 then |
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242 send(st.stanza("stream:features") |
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243 :tag("dialback", { xmlns='urn:xmpp:features:dialback' }):tag("optional"):up():up()); |
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244 end |
| 148 | 245 elseif session.direction == "outgoing" then |
| 246 -- If we are just using the connection for verifying dialback keys, we won't try and auth it | |
|
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247 if not attr.id then error("stream response did not give us a streamid!!!"); end |
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248 session.streamid = attr.id; |
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249 |
| 148 | 250 if not session.dialback_verifying then |
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251 initiate_dialback(session); |
| 148 | 252 else |
| 253 mark_connected(session); | |
| 254 end | |
| 255 end | |
| 259 | 256 |
| 148 | 257 session.notopen = nil; |
| 258 end | |
| 259 | |
|
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260 function initiate_dialback(session) |
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261 -- generate dialback key |
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262 session.dialback_key = generate_dialback(session.streamid, session.to_host, session.from_host); |
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263 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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264 session.log("info", "sent dialback key on outgoing s2s stream"); |
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265 end |
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266 |
| 148 | 267 function generate_dialback(id, to, from) |
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268 return sha256_hash(id..to..from..dialback_secret, true); |
| 148 | 269 end |
| 270 | |
| 271 function verify_dialback(id, to, from, key) | |
| 272 return key == generate_dialback(id, to, from); | |
| 273 end | |
| 274 | |
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275 function make_authenticated(session, host) |
| 148 | 276 if session.type == "s2sout_unauthed" then |
| 277 session.type = "s2sout"; | |
| 278 elseif session.type == "s2sin_unauthed" then | |
| 279 session.type = "s2sin"; | |
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280 if host then |
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281 session.hosts[host].authed = true; |
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282 end |
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283 elseif session.type == "s2sin" and host then |
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284 session.hosts[host].authed = true; |
| 148 | 285 else |
| 286 return false; | |
| 287 end | |
| 288 session.log("info", "connection is now authenticated"); | |
| 289 | |
| 290 mark_connected(session); | |
| 291 | |
| 292 return true; | |
| 293 end | |
| 294 | |
| 295 function mark_connected(session) | |
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296 local sendq, send = session.sendq, session.sends2s; |
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297 |
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298 local from, to = session.from_host, session.to_host; |
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299 |
|
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300 session.log("debug", session.direction.." s2s connection "..from.."->"..to.." is now complete"); |
|
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301 |
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302 local send_to_host = send_to_host; |
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303 function session.send(data) send_to_host(to, from, data); end |
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304 |
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sends2s -> s2s_session.send(), s2s_session.send() -> s2s_session.sends2s()
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305 |
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306 if session.direction == "outgoing" then |
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307 if sendq then |
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308 session.log("debug", "sending "..#sendq.." queued stanzas across new outgoing connection to "..session.to_host); |
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309 for i, data in ipairs(sendq) do |
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310 send(data[1]); |
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311 sendq[i] = nil; |
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312 end |
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313 session.sendq = nil; |
| 148 | 314 end |
| 315 end | |
| 316 end | |
| 317 | |
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318 function destroy_session(session) |
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319 (session.log or log)("info", "Destroying "..tostring(session.direction).." session "..tostring(session.from_host).."->"..tostring(session.to_host)); |
| 331 | 320 |
| 321 | |
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322 if session.direction == "outgoing" then |
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323 hosts[session.from_host].s2sout[session.to_host] = nil; |
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324 bounce_sendq(session); |
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325 elseif session.direction == "incoming" then |
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326 incoming_s2s[session] = nil; |
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327 end |
| 331 | 328 |
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329 for k in pairs(session) do |
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330 if k ~= "trace" then |
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331 session[k] = nil; |
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332 end |
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333 end |
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334 end |
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335 |
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Just committing this warning, because I want to know if the problem really affects us
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336 return _M; |
