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core/s2smanager.lua @ 621:cd2cab5400fc
Add support for dialback piggy-backing. Fixes #37. Thanks to CShadowRun for helping me test :)
| author | Matthew Wild <mwild1@gmail.com> |
|---|---|
| date | Sat, 13 Dec 2008 17:43:52 +0000 |
| parent | 615:4ae3e81513f3 |
| child | 631:6957fe7b0313 |
| rev | line source |
|---|---|
| 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; | |
| 24 local socket = require "socket"; | |
| 25 local format = string.format; | |
| 337 | 26 local t_insert, t_sort = table.insert, table.sort; |
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27 local get_traceback = debug.traceback; |
| 148 | 28 local tostring, pairs, ipairs, getmetatable, print, newproxy, error, tonumber |
| 29 = tostring, pairs, ipairs, getmetatable, print, newproxy, error, tonumber; | |
| 30 | |
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31 local idna_to_ascii = require "util.encodings".idna.to_ascii; |
| 148 | 32 local connlisteners_get = require "net.connlisteners".get; |
| 33 local wraptlsclient = require "net.server".wraptlsclient; | |
| 34 local modulemanager = require "core.modulemanager"; | |
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35 local st = require "stanza"; |
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36 local stanza = st.stanza; |
| 148 | 37 |
| 38 local uuid_gen = require "util.uuid".generate; | |
| 39 | |
| 40 local logger_init = require "util.logger".init; | |
| 41 | |
| 42 local log = logger_init("s2smanager"); | |
| 43 | |
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44 local sha256_hash = require "util.hashes".sha256; |
| 148 | 45 |
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46 local dialback_secret = sha256_hash(tostring{} .. math.random() .. socket.gettime(), true); |
| 148 | 47 |
| 337 | 48 local dns = require "net.dns"; |
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49 |
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50 incoming_s2s = {}; |
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51 local incoming_s2s = incoming_s2s; |
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52 |
| 148 | 53 module "s2smanager" |
| 54 | |
| 337 | 55 local function compare_srv_priorities(a,b) return a.priority < b.priority or a.weight < b.weight; end |
| 56 | |
| 148 | 57 function send_to_host(from_host, to_host, data) |
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58 local host = hosts[from_host].s2sout[to_host]; |
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59 if host then |
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60 -- We have a connection to this host already |
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61 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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62 (host.log or log)("debug", "trying to send over unauthed s2sout to "..to_host); |
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63 if not host.notopen and not host.dialback_key then |
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64 host.log("debug", "dialback had not been initiated"); |
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65 initiate_dialback(host); |
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66 end |
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67 |
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68 -- Queue stanza until we are able to send it |
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69 if host.sendq then t_insert(host.sendq, tostring(data)); |
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70 else host.sendq = { tostring(data) }; end |
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71 host.log("debug", "stanza [%s] queued ", data.name); |
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72 elseif host.type == "local" or host.type == "component" then |
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73 log("error", "Trying to send a stanza to ourselves??") |
| 256 | 74 log("error", "Traceback: %s", get_traceback()); |
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75 log("error", "Stanza: %s", tostring(data)); |
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76 else |
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77 (host.log or log)("debug", "going to send stanza to "..to_host.." from "..from_host); |
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78 -- FIXME |
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79 if host.from_host ~= from_host then |
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80 log("error", "WARNING! This might, possibly, be a bug, but it might not..."); |
| 331 | 81 log("error", "We are going to send from %s instead of %s", tostring(host.from_host), tostring(from_host)); |
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82 end |
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83 host.sends2s(data); |
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84 host.log("debug", "stanza sent over "..host.type); |
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85 end |
| 148 | 86 else |
| 87 log("debug", "opening a new outgoing connection for this stanza"); | |
| 88 local host_session = new_outgoing(from_host, to_host); | |
| 89 -- Store in buffer | |
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90 host_session.sendq = { tostring(data) }; |
| 148 | 91 end |
| 92 end | |
| 93 | |
| 94 local open_sessions = 0; | |
| 95 | |
| 96 function new_incoming(conn) | |
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97 local session = { conn = conn, type = "s2sin_unauthed", direction = "incoming", hosts = {} }; |
| 148 | 98 if true then |
| 99 session.trace = newproxy(true); | |
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100 getmetatable(session.trace).__gc = function () open_sessions = open_sessions - 1; end; |
| 148 | 101 end |
| 102 open_sessions = open_sessions + 1; | |
| 343 | 103 local w, log = conn.write, logger_init("s2sin"..tostring(conn):match("[a-f0-9]+$")); |
| 104 session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end | |
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105 incoming_s2s[session] = true; |
| 148 | 106 return session; |
| 107 end | |
| 108 | |
| 109 function new_outgoing(from_host, to_host) | |
| 110 local host_session = { to_host = to_host, from_host = from_host, notopen = true, type = "s2sout_unauthed", direction = "outgoing" }; | |
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111 hosts[from_host].s2sout[to_host] = host_session; |
| 148 | 112 |
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113 local log; |
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114 do |
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115 local conn_name = "s2sout"..tostring(host_session):match("[a-f0-9]*$"); |
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116 log = logger_init(conn_name); |
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117 host_session.log = log; |
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118 end |
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119 |
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120 attempt_connection(host_session); |
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121 |
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122 return host_session; |
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123 end |
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124 |
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125 |
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126 function attempt_connection(host_session, err) |
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127 local from_host, to_host = host_session.from_host, host_session.to_host; |
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128 local conn, handler = socket.tcp() |
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129 |
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130 local connect_host, connect_port = idna_to_ascii(to_host), 5269; |
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131 |
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132 if not err then -- This is our first attempt |
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133 local answer = dns.lookup("_xmpp-server._tcp."..connect_host..".", "SRV"); |
| 337 | 134 |
| 135 if answer then | |
| 136 log("debug", to_host.." has SRV records, handling..."); | |
| 137 local srv_hosts = {}; | |
| 138 host_session.srv_hosts = srv_hosts; | |
| 139 for _, record in ipairs(answer) do | |
| 140 t_insert(srv_hosts, record.srv); | |
| 141 end | |
| 142 t_sort(srv_hosts, compare_srv_priorities); | |
| 143 | |
| 144 local srv_choice = srv_hosts[1]; | |
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145 host_session.srv_choice = 1; |
| 337 | 146 if srv_choice then |
| 147 connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port; | |
| 148 log("debug", "Best record found, will connect to %s:%d", connect_host, connect_port); | |
| 149 end | |
| 150 end | |
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151 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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152 host_session.srv_choice = host_session.srv_choice + 1; |
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153 local srv_choice = host_session.srv_hosts[host_session.srv_choice]; |
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154 connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port; |
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155 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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156 else |
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157 host_session.log("debug", "Out of connection options, can't connect to %s", tostring(host_session.to_host)); |
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158 -- We're out of options |
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159 return false; |
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160 end |
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161 |
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162 -- Ok, we're going to try to connect |
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163 conn:settimeout(0); |
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164 local success, err = conn:connect(connect_host, connect_port); |
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165 if not success and err ~= "timeout" then |
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166 log("warn", "s2s connect() failed: %s", err); |
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167 end |
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168 |
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169 local cl = connlisteners_get("xmppserver"); |
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170 conn = wraptlsclient(cl, conn, connect_host, connect_port, 0, cl.default_mode or 1, hosts[from_host].ssl_ctx ); |
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171 host_session.conn = conn; |
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172 |
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173 -- Register this outgoing connection so that xmppserver_listener knows about it |
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174 -- otherwise it will assume it is a new incoming connection |
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175 cl.register_outgoing(conn, host_session); |
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176 |
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177 local w = conn.write; |
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178 host_session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end |
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179 |
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180 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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181 return true; |
| 148 | 182 end |
| 183 | |
| 184 function streamopened(session, attr) | |
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185 local send = session.sends2s; |
| 148 | 186 |
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187 -- TODO: #29: SASL/TLS on s2s streams |
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188 session.version = 0; --tonumber(attr.version) or 0; |
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189 |
| 148 | 190 if session.version >= 1.0 and not (attr.to and attr.from) then |
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191 --print("to: "..tostring(attr.to).." from: "..tostring(attr.from)); |
| 148 | 192 log("warn", (session.to_host or "(unknown)").." failed to specify 'to' or 'from' hostname as per RFC"); |
| 193 end | |
| 194 | |
| 195 if session.direction == "incoming" then | |
| 196 -- Send a reply stream header | |
| 197 | |
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198 --for k,v in pairs(attr) do print("", tostring(k), ":::", tostring(v)); end |
| 148 | 199 |
| 200 session.to_host = attr.to; | |
| 201 session.from_host = attr.from; | |
| 202 | |
| 203 session.streamid = uuid_gen(); | |
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204 (session.log or log)("debug", "incoming s2s received <stream:stream>"); |
| 148 | 205 send("<?xml version='1.0'?>"); |
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206 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 | 207 if session.to_host and not hosts[session.to_host] then |
| 208 -- Attempting to connect to a host we don't serve | |
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209 session:close({ condition = "host-unknown"; text = "This host does not serve "..session.to_host }); |
| 331 | 210 return; |
| 211 end | |
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212 if session.version >= 1.0 then |
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213 send(st.stanza("stream:features") |
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214 :tag("dialback", { xmlns='urn:xmpp:features:dialback' }):tag("optional"):up():up()); |
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215 end |
| 148 | 216 elseif session.direction == "outgoing" then |
| 217 -- If we are just using the connection for verifying dialback keys, we won't try and auth it | |
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218 if not attr.id then error("stream response did not give us a streamid!!!"); end |
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219 session.streamid = attr.id; |
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220 |
| 148 | 221 if not session.dialback_verifying then |
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222 initiate_dialback(session); |
| 148 | 223 else |
| 224 mark_connected(session); | |
| 225 end | |
| 226 end | |
| 259 | 227 |
| 148 | 228 session.notopen = nil; |
| 229 end | |
| 230 | |
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231 function initiate_dialback(session) |
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232 -- generate dialback key |
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233 session.dialback_key = generate_dialback(session.streamid, session.to_host, session.from_host); |
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234 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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235 session.log("info", "sent dialback key on outgoing s2s stream"); |
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236 end |
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237 |
| 148 | 238 function generate_dialback(id, to, from) |
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239 return sha256_hash(id..to..from..dialback_secret, true); |
| 148 | 240 end |
| 241 | |
| 242 function verify_dialback(id, to, from, key) | |
| 243 return key == generate_dialback(id, to, from); | |
| 244 end | |
| 245 | |
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246 function make_authenticated(session, host) |
| 148 | 247 if session.type == "s2sout_unauthed" then |
| 248 session.type = "s2sout"; | |
| 249 elseif session.type == "s2sin_unauthed" then | |
| 250 session.type = "s2sin"; | |
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251 if host then |
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252 session.hosts[host].authed = true; |
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253 end |
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254 elseif session.type == "s2sin" and host then |
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255 session.hosts[host].authed = true; |
| 148 | 256 else |
| 257 return false; | |
| 258 end | |
| 259 session.log("info", "connection is now authenticated"); | |
| 260 | |
| 261 mark_connected(session); | |
| 262 | |
| 263 return true; | |
| 264 end | |
| 265 | |
| 266 function mark_connected(session) | |
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267 local sendq, send = session.sendq, session.sends2s; |
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268 |
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269 local from, to = session.from_host, session.to_host; |
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270 |
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271 session.log("debug", session.direction.." s2s connection "..from.."->"..to.." is now complete"); |
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272 |
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273 local send_to_host = send_to_host; |
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274 function session.send(data) send_to_host(to, from, data); end |
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275 |
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276 |
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277 if session.direction == "outgoing" then |
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278 if sendq then |
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279 session.log("debug", "sending "..#sendq.." queued stanzas across new outgoing connection to "..session.to_host); |
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280 for i, data in ipairs(sendq) do |
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281 send(data); |
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282 sendq[i] = nil; |
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283 end |
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284 session.sendq = nil; |
| 148 | 285 end |
| 286 end | |
| 287 end | |
| 288 | |
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289 function destroy_session(session) |
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290 (session.log or log)("info", "Destroying "..tostring(session.direction).." session "..tostring(session.from_host).."->"..tostring(session.to_host)); |
| 331 | 291 |
| 292 -- FIXME: Flush sendq here/report errors to originators | |
| 293 | |
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294 if session.direction == "outgoing" then |
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295 hosts[session.from_host].s2sout[session.to_host] = nil; |
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296 elseif session.direction == "incoming" then |
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297 incoming_s2s[session] = nil; |
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298 end |
| 331 | 299 |
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300 for k in pairs(session) do |
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301 if k ~= "trace" then |
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302 session[k] = nil; |
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303 end |
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304 end |
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parents:
162
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changeset
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305 end |
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8dc1faa5b1df
other half of previous commit
Matthew Wild <mwild1@gmail.com>
parents:
162
diff
changeset
|
306 |
|
225
bbbd169b326b
Just committing this warning, because I want to know if the problem really affects us
Matthew Wild <mwild1@gmail.com>
parents:
199
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changeset
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307 return _M; |
