Fri, 17 Apr 2009 16:11:11 +0100
net.server: Fix potential nil handler usage
894 | 1 | -- Prosody IM v0.4 |
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Update copyright notices for 2009
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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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core.s2smanager: Remove some debugging
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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"; |
244
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25 | local st = require "stanza"; |
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26 | local stanza = st.stanza; |
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Fixed: s2smanager: Apply nameprep on hostnames passed in stream tag (part of issue #57)
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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("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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Remove an incorrect line which I didn't add, and fix the proper way. Corrects the sending of stanzas over unauthed s2sout's. Also fixes mod_dialback to send stanzas and not strings.
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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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core.s2smanager: Don't initiate dialback if we don't have a connection yet
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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)} }; |
974 | 108 | if (not host_session.connecting) and (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 connect_host, connect_port = idna_to_ascii(to_host), 5269; |
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147 | |
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148 | if not err then -- This is our first attempt |
974 | 149 | host_session.connecting = true; |
150 | local answer = | |
151 | adns.lookup(function (answer) | |
152 | host_session.connecting = nil; | |
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]; | |
163 | host_session.srv_choice = 1; | |
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 | else | |
169 | log("debug", to_host.." has no SRV records, falling back to A"); | |
337 | 170 | end |
974 | 171 | -- Try with SRV, or just the plain hostname if no SRV |
172 | return try_connect(host_session, connect_host, connect_port); | |
173 | end, "_xmpp-server._tcp."..connect_host..".", "SRV"); | |
174 | return true; -- Attempt in progress | |
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175 | 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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176 | host_session.srv_choice = host_session.srv_choice + 1; |
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177 | local srv_choice = host_session.srv_hosts[host_session.srv_choice]; |
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178 | connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port; |
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179 | 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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180 | else |
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181 | host_session.log("debug", "Out of connection options, can't connect to %s", tostring(host_session.to_host)); |
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182 | -- We're out of options |
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183 | return false; |
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184 | end |
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185 | |
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186 | if not (connect_host and connect_port) then |
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187 | -- Likely we couldn't resolve DNS |
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188 | return false; |
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189 | end |
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190 | |
974 | 191 | return try_connect(host_session, connect_host, connect_port); |
192 | end | |
193 | ||
194 | function try_connect(host_session, connect_host, connect_port) | |
195 | log("debug", "Beginning new connection attempt to %s (%s:%d)", host_session.to_host, connect_host, connect_port); | |
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196 | -- Ok, we're going to try to connect |
974 | 197 | |
198 | local from_host, to_host = host_session.from_host, host_session.to_host; | |
199 | ||
200 | local conn, handler = socket.tcp() | |
201 | ||
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202 | conn:settimeout(0); |
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203 | local success, err = conn:connect(connect_host, connect_port); |
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204 | if not success and err ~= "timeout" then |
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205 | log("warn", "s2s connect() failed: %s", err); |
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206 | return false; |
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207 | end |
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208 | |
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209 | local cl = connlisteners_get("xmppserver"); |
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210 | conn = wrapclient(conn, connect_host, connect_port, cl, cl.default_mode or 1, hosts[from_host].ssl_ctx, false ); |
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211 | host_session.conn = conn; |
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212 | |
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213 | -- Register this outgoing connection so that xmppserver_listener knows about it |
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214 | -- otherwise it will assume it is a new incoming connection |
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215 | cl.register_outgoing(conn, host_session); |
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216 | |
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217 | local w = conn.write; |
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218 | host_session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end |
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219 | |
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220 | 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 | 221 | log("debug", "Connection attempt in progress..."); |
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222 | return true; |
148 | 223 | end |
224 | ||
225 | function streamopened(session, attr) | |
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226 | local send = session.sends2s; |
148 | 227 | |
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228 | -- TODO: #29: SASL/TLS on s2s streams |
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229 | session.version = 0; --tonumber(attr.version) or 0; |
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230 | |
148 | 231 | if session.version >= 1.0 and not (attr.to and attr.from) then |
232 | log("warn", (session.to_host or "(unknown)").." failed to specify 'to' or 'from' hostname as per RFC"); | |
233 | end | |
234 | ||
235 | if session.direction == "incoming" then | |
236 | -- Send a reply stream header | |
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237 | session.to_host = attr.to and nameprep(attr.to); |
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238 | session.from_host = attr.from and nameprep(attr.from); |
148 | 239 | |
240 | session.streamid = uuid_gen(); | |
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241 | (session.log or log)("debug", "incoming s2s received <stream:stream>"); |
148 | 242 | send("<?xml version='1.0'?>"); |
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243 | send(stanza("stream:stream", { xmlns='jabber:server', ["xmlns:db"]='jabber:server:dialback', |
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244 | ["xmlns:stream"]='http://etherx.jabber.org/streams', id=session.streamid, from=session.to_host }):top_tag()); |
331 | 245 | if session.to_host and not hosts[session.to_host] then |
246 | -- Attempting to connect to a host we don't serve | |
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247 | session:close({ condition = "host-unknown"; text = "This host does not serve "..session.to_host }); |
331 | 248 | return; |
249 | end | |
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250 | if session.version >= 1.0 then |
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251 | send(st.stanza("stream:features") |
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252 | :tag("dialback", { xmlns='urn:xmpp:features:dialback' }):tag("optional"):up():up()); |
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253 | end |
148 | 254 | elseif session.direction == "outgoing" then |
255 | -- If we are just using the connection for verifying dialback keys, we won't try and auth it | |
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256 | if not attr.id then error("stream response did not give us a streamid!!!"); end |
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257 | session.streamid = attr.id; |
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258 | |
148 | 259 | if not session.dialback_verifying then |
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260 | initiate_dialback(session); |
148 | 261 | else |
262 | mark_connected(session); | |
263 | end | |
264 | end | |
259 | 265 | |
148 | 266 | session.notopen = nil; |
267 | end | |
268 | ||
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269 | function streamclosed(session) |
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270 | session.sends2s("</stream:stream>"); |
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271 | session.notopen = true; |
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272 | end |
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273 | |
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274 | function initiate_dialback(session) |
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275 | -- generate dialback key |
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276 | session.dialback_key = generate_dialback(session.streamid, session.to_host, session.from_host); |
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277 | 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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278 | session.log("info", "sent dialback key on outgoing s2s stream"); |
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279 | end |
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280 | |
148 | 281 | function generate_dialback(id, to, from) |
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282 | return sha256_hash(id..to..from..dialback_secret, true); |
148 | 283 | end |
284 | ||
285 | function verify_dialback(id, to, from, key) | |
286 | return key == generate_dialback(id, to, from); | |
287 | end | |
288 | ||
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289 | function make_authenticated(session, host) |
148 | 290 | if session.type == "s2sout_unauthed" then |
291 | session.type = "s2sout"; | |
292 | elseif session.type == "s2sin_unauthed" then | |
293 | session.type = "s2sin"; | |
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294 | if host then |
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295 | session.hosts[host].authed = true; |
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296 | end |
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297 | elseif session.type == "s2sin" and host then |
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298 | session.hosts[host].authed = true; |
148 | 299 | else |
300 | return false; | |
301 | end | |
302 | session.log("info", "connection is now authenticated"); | |
303 | ||
304 | mark_connected(session); | |
305 | ||
306 | return true; | |
307 | end | |
308 | ||
309 | function mark_connected(session) | |
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310 | local sendq, send = session.sendq, session.sends2s; |
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311 | |
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312 | local from, to = session.from_host, session.to_host; |
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313 | |
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314 | session.log("debug", session.direction.." s2s connection "..from.."->"..to.." is now complete"); |
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315 | |
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316 | local send_to_host = send_to_host; |
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317 | function session.send(data) send_to_host(to, from, data); end |
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318 | |
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319 | |
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320 | if session.direction == "outgoing" then |
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321 | if sendq then |
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322 | session.log("debug", "sending "..#sendq.." queued stanzas across new outgoing connection to "..session.to_host); |
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323 | for i, data in ipairs(sendq) do |
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324 | send(data[1]); |
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325 | sendq[i] = nil; |
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326 | end |
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327 | session.sendq = nil; |
148 | 328 | end |
329 | end | |
330 | end | |
331 | ||
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332 | function destroy_session(session) |
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333 | (session.log or log)("info", "Destroying "..tostring(session.direction).." session "..tostring(session.from_host).."->"..tostring(session.to_host)); |
331 | 334 | |
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335 | if session.direction == "outgoing" then |
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336 | hosts[session.from_host].s2sout[session.to_host] = nil; |
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337 | bounce_sendq(session); |
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338 | elseif session.direction == "incoming" then |
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339 | incoming_s2s[session] = nil; |
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340 | end |
331 | 341 | |
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342 | for k in pairs(session) do |
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343 | if k ~= "trace" then |
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344 | session[k] = nil; |
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345 | end |
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346 | end |
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347 | end |
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348 | |
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Just committing this warning, because I want to know if the problem really affects us
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349 | return _M; |