Tue, 16 Dec 2008 02:32:01 +0000
Protect loading of connlisteners, to catch errors
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 | |
190
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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 | ||
190
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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 | |
190
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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); |
190
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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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305 | end |
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306 | |
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307 | return _M; |