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core/s2smanager.lua @ 593:121d82243023
Slightly more secure dialback secret generation
| author | Matthew Wild <mwild1@gmail.com> |
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| date | Sun, 07 Dec 2008 03:12:22 +0000 |
| parent | 583:5821eaa80baa |
| child | 615:4ae3e81513f3 |
| rev | line source |
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1 -- Prosody IM v0.1 |
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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 |
| 148 | 50 module "s2smanager" |
| 51 | |
| 337 | 52 local function compare_srv_priorities(a,b) return a.priority < b.priority or a.weight < b.weight; end |
| 53 | |
| 148 | 54 function send_to_host(from_host, to_host, data) |
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55 local host = hosts[from_host].s2sout[to_host]; |
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56 if host then |
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57 -- We have a connection to this host already |
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58 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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59 (host.log or log)("debug", "trying to send over unauthed s2sout to "..to_host); |
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60 if not host.notopen and not host.dialback_key then |
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61 host.log("debug", "dialback had not been initiated"); |
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62 initiate_dialback(host); |
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63 end |
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64 |
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65 -- Queue stanza until we are able to send it |
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66 if host.sendq then t_insert(host.sendq, tostring(data)); |
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67 else host.sendq = { tostring(data) }; end |
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68 host.log("debug", "stanza [%s] queued ", data.name); |
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69 elseif host.type == "local" or host.type == "component" then |
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70 log("error", "Trying to send a stanza to ourselves??") |
| 256 | 71 log("error", "Traceback: %s", get_traceback()); |
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72 log("error", "Stanza: %s", tostring(data)); |
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73 else |
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74 (host.log or log)("debug", "going to send stanza to "..to_host.." from "..from_host); |
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75 -- FIXME |
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76 if host.from_host ~= from_host then |
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77 log("error", "WARNING! This might, possibly, be a bug, but it might not..."); |
| 331 | 78 log("error", "We are going to send from %s instead of %s", tostring(host.from_host), tostring(from_host)); |
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79 end |
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80 host.sends2s(data); |
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81 host.log("debug", "stanza sent over "..host.type); |
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82 end |
| 148 | 83 else |
| 84 log("debug", "opening a new outgoing connection for this stanza"); | |
| 85 local host_session = new_outgoing(from_host, to_host); | |
| 86 -- Store in buffer | |
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87 host_session.sendq = { tostring(data) }; |
| 148 | 88 end |
| 89 end | |
| 90 | |
| 91 local open_sessions = 0; | |
| 92 | |
| 93 function new_incoming(conn) | |
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94 local session = { conn = conn, type = "s2sin_unauthed", direction = "incoming" }; |
| 148 | 95 if true then |
| 96 session.trace = newproxy(true); | |
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97 getmetatable(session.trace).__gc = function () open_sessions = open_sessions - 1; end; |
| 148 | 98 end |
| 99 open_sessions = open_sessions + 1; | |
| 343 | 100 local w, log = conn.write, logger_init("s2sin"..tostring(conn):match("[a-f0-9]+$")); |
| 101 session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end | |
| 148 | 102 return session; |
| 103 end | |
| 104 | |
| 105 function new_outgoing(from_host, to_host) | |
| 106 local host_session = { to_host = to_host, from_host = from_host, notopen = true, type = "s2sout_unauthed", direction = "outgoing" }; | |
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107 hosts[from_host].s2sout[to_host] = host_session; |
| 148 | 108 |
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109 local log; |
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110 do |
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111 local conn_name = "s2sout"..tostring(host_session):match("[a-f0-9]*$"); |
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112 log = logger_init(conn_name); |
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113 host_session.log = log; |
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114 end |
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115 |
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116 attempt_connection(host_session); |
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117 |
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118 return host_session; |
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119 end |
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120 |
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121 |
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122 function attempt_connection(host_session, err) |
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123 local from_host, to_host = host_session.from_host, host_session.to_host; |
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124 local conn, handler = socket.tcp() |
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125 |
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126 local connect_host, connect_port = idna_to_ascii(to_host), 5269; |
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127 |
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128 if not err then -- This is our first attempt |
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129 local answer = dns.lookup("_xmpp-server._tcp."..connect_host..".", "SRV"); |
| 337 | 130 |
| 131 if answer then | |
| 132 log("debug", to_host.." has SRV records, handling..."); | |
| 133 local srv_hosts = {}; | |
| 134 host_session.srv_hosts = srv_hosts; | |
| 135 for _, record in ipairs(answer) do | |
| 136 t_insert(srv_hosts, record.srv); | |
| 137 end | |
| 138 t_sort(srv_hosts, compare_srv_priorities); | |
| 139 | |
| 140 local srv_choice = srv_hosts[1]; | |
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141 host_session.srv_choice = 1; |
| 337 | 142 if srv_choice then |
| 143 connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port; | |
| 144 log("debug", "Best record found, will connect to %s:%d", connect_host, connect_port); | |
| 145 end | |
| 146 end | |
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147 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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148 host_session.srv_choice = host_session.srv_choice + 1; |
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149 local srv_choice = host_session.srv_hosts[host_session.srv_choice]; |
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150 connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port; |
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151 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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152 else |
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153 host_session.log("debug", "Out of connection options, can't connect to %s", tostring(host_session.to_host)); |
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154 -- We're out of options |
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155 return false; |
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156 end |
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157 |
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158 -- Ok, we're going to try to connect |
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159 conn:settimeout(0); |
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160 local success, err = conn:connect(connect_host, connect_port); |
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161 if not success and err ~= "timeout" then |
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162 log("warn", "s2s connect() failed: %s", err); |
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163 end |
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164 |
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165 local cl = connlisteners_get("xmppserver"); |
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166 conn = wraptlsclient(cl, conn, connect_host, connect_port, 0, cl.default_mode or 1, hosts[from_host].ssl_ctx ); |
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167 host_session.conn = conn; |
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168 |
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169 -- Register this outgoing connection so that xmppserver_listener knows about it |
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170 -- otherwise it will assume it is a new incoming connection |
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171 cl.register_outgoing(conn, host_session); |
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172 |
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173 local w = conn.write; |
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174 host_session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end |
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175 |
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176 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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177 return true; |
| 148 | 178 end |
| 179 | |
| 180 function streamopened(session, attr) | |
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181 local send = session.sends2s; |
| 148 | 182 |
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183 -- TODO: #29: SASL/TLS on s2s streams |
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184 session.version = 0; --tonumber(attr.version) or 0; |
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185 |
| 148 | 186 if session.version >= 1.0 and not (attr.to and attr.from) then |
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187 --print("to: "..tostring(attr.to).." from: "..tostring(attr.from)); |
| 148 | 188 log("warn", (session.to_host or "(unknown)").." failed to specify 'to' or 'from' hostname as per RFC"); |
| 189 end | |
| 190 | |
| 191 if session.direction == "incoming" then | |
| 192 -- Send a reply stream header | |
| 193 | |
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194 --for k,v in pairs(attr) do print("", tostring(k), ":::", tostring(v)); end |
| 148 | 195 |
| 196 session.to_host = attr.to; | |
| 197 session.from_host = attr.from; | |
| 198 | |
| 199 session.streamid = uuid_gen(); | |
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200 (session.log or log)("debug", "incoming s2s received <stream:stream>"); |
| 148 | 201 send("<?xml version='1.0'?>"); |
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202 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 | 203 if session.to_host and not hosts[session.to_host] then |
| 204 -- Attempting to connect to a host we don't serve | |
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205 session:close({ condition = "host-unknown"; text = "This host does not serve "..session.to_host }); |
| 331 | 206 return; |
| 207 end | |
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208 if session.version >= 1.0 then |
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209 send(st.stanza("stream:features") |
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210 :tag("dialback", { xmlns='urn:xmpp:features:dialback' }):tag("optional"):up():up()); |
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211 end |
| 148 | 212 elseif session.direction == "outgoing" then |
| 213 -- If we are just using the connection for verifying dialback keys, we won't try and auth it | |
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214 if not attr.id then error("stream response did not give us a streamid!!!"); end |
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215 session.streamid = attr.id; |
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216 |
| 148 | 217 if not session.dialback_verifying then |
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218 initiate_dialback(session); |
| 148 | 219 else |
| 220 mark_connected(session); | |
| 221 end | |
| 222 end | |
| 259 | 223 |
| 148 | 224 session.notopen = nil; |
| 225 end | |
| 226 | |
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227 function initiate_dialback(session) |
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228 -- generate dialback key |
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229 session.dialback_key = generate_dialback(session.streamid, session.to_host, session.from_host); |
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230 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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231 session.log("info", "sent dialback key on outgoing s2s stream"); |
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232 end |
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233 |
| 148 | 234 function generate_dialback(id, to, from) |
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235 return sha256_hash(id..to..from..dialback_secret, true); |
| 148 | 236 end |
| 237 | |
| 238 function verify_dialback(id, to, from, key) | |
| 239 return key == generate_dialback(id, to, from); | |
| 240 end | |
| 241 | |
| 242 function make_authenticated(session) | |
| 243 if session.type == "s2sout_unauthed" then | |
| 244 session.type = "s2sout"; | |
| 245 elseif session.type == "s2sin_unauthed" then | |
| 246 session.type = "s2sin"; | |
| 247 else | |
| 248 return false; | |
| 249 end | |
| 250 session.log("info", "connection is now authenticated"); | |
| 251 | |
| 252 mark_connected(session); | |
| 253 | |
| 254 return true; | |
| 255 end | |
| 256 | |
| 257 function mark_connected(session) | |
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258 local sendq, send = session.sendq, session.sends2s; |
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259 |
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260 local from, to = session.from_host, session.to_host; |
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261 |
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262 session.log("debug", session.direction.." s2s connection "..from.."->"..to.." is now complete"); |
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263 |
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264 local send_to_host = send_to_host; |
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265 function session.send(data) send_to_host(to, from, data); end |
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266 |
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267 |
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268 if session.direction == "outgoing" then |
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269 if sendq then |
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270 session.log("debug", "sending "..#sendq.." queued stanzas across new outgoing connection to "..session.to_host); |
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271 for i, data in ipairs(sendq) do |
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272 send(data); |
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273 sendq[i] = nil; |
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274 end |
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275 session.sendq = nil; |
| 148 | 276 end |
| 277 end | |
| 278 end | |
| 279 | |
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280 function destroy_session(session) |
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281 (session.log or log)("info", "Destroying "..tostring(session.direction).." session "..tostring(session.from_host).."->"..tostring(session.to_host)); |
| 331 | 282 |
| 283 -- FIXME: Flush sendq here/report errors to originators | |
| 284 | |
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285 if session.direction == "outgoing" then |
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286 hosts[session.from_host].s2sout[session.to_host] = nil; |
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287 end |
| 331 | 288 |
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289 for k in pairs(session) do |
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290 if k ~= "trace" then |
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291 session[k] = nil; |
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292 end |
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293 end |
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294 end |
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295 |
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296 return _M; |
