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149
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1
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2 local hosts = hosts;
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3 local sessions = sessions;
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4 local socket = require "socket";
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5 local format = string.format;
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6 local tostring, pairs, ipairs, getmetatable, print, newproxy, error, tonumber
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7 = tostring, pairs, ipairs, getmetatable, print, newproxy, error, tonumber;
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8
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9 local connlisteners_get = require "net.connlisteners".get;
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10 local wraptlsclient = require "net.server".wraptlsclient;
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11 local modulemanager = require "core.modulemanager";
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12
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13 local uuid_gen = require "util.uuid".generate;
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14
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15 local logger_init = require "util.logger".init;
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16
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17 local log = logger_init("s2smanager");
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18
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19 local md5_hash = require "util.hashes".md5;
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20
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21 local dialback_secret = "This is very secret!!! Ha!";
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22
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23 module "s2smanager"
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24
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25 function connect_host(from_host, to_host)
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26 end
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27
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28 function send_to_host(from_host, to_host, data)
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29 if hosts[to_host] then
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30 -- Write to connection
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31 hosts[to_host].send(data);
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32 log("debug", "stanza sent over s2s");
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33 else
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34 log("debug", "opening a new outgoing connection for this stanza");
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35 local host_session = new_outgoing(from_host, to_host);
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36 -- Store in buffer
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37 host_session.sendq = { data };
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38 end
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39 end
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40
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41 function disconnect_host(host)
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42
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43 end
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44
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45 local open_sessions = 0;
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46
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47 function new_incoming(conn)
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48 local session = { conn = conn, priority = 0, type = "s2sin_unauthed", direction = "incoming" };
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49 if true then
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50 session.trace = newproxy(true);
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51 getmetatable(session.trace).__gc = function () open_sessions = open_sessions - 1; print("s2s session got collected, now "..open_sessions.." s2s sessions are allocated") end;
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52 end
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53 open_sessions = open_sessions + 1;
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54 local w = conn.write;
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55 session.send = function (t) w(tostring(t)); end
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56 return session;
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57 end
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58
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59 function new_outgoing(from_host, to_host)
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60 local host_session = { to_host = to_host, from_host = from_host, notopen = true, type = "s2sout_unauthed", direction = "outgoing" };
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61 hosts[to_host] = host_session;
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62
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63 local cl = connlisteners_get("xmppserver");
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64
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65 local conn, handler = socket.tcp()
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66 --FIXME: Below parameters (ports/ip) are incorrect (use SRV)
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67 conn:connect(to_host, 5269);
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68 conn = wraptlsclient(cl, conn, to_host, 5269, 0, 1, hosts[from_host].ssl_ctx );
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69 host_session.conn = conn;
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70
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71 -- Register this outgoing connection so that xmppserver_listener knows about it
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72 -- otherwise it will assume it is a new incoming connection
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73 cl.register_outgoing(conn, host_session);
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74
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75 do
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76 local conn_name = "s2sout"..tostring(conn):match("[a-f0-9]*$");
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77 host_session.log = logger_init(conn_name);
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78 end
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79
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80 local w = conn.write;
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81 host_session.send = function (t) w(tostring(t)); end
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82
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83 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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84
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85 return host_session;
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86 end
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87
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88 function streamopened(session, attr)
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89 session.log("debug", "s2s stream opened");
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90 local send = session.send;
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91
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92 session.version = tonumber(attr.version) or 0;
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93 if session.version >= 1.0 and not (attr.to and attr.from) then
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94 print("to: "..tostring(attr.to).." from: "..tostring(attr.from));
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95 --error(session.to_host.." failed to specify 'to' or 'from' hostname as per RFC");
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96 log("warn", (session.to_host or "(unknown)").." failed to specify 'to' or 'from' hostname as per RFC");
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97 end
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98
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99 if session.direction == "incoming" then
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100 -- Send a reply stream header
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101
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102 for k,v in pairs(attr) do print("", tostring(k), ":::", tostring(v)); end
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103
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104 session.to_host = attr.to;
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105 session.from_host = attr.from;
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106
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107 session.streamid = uuid_gen();
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108 print(session, session.from_host, "incoming s2s stream opened");
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109 send("<?xml version='1.0'?>");
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110 send(format("<stream:stream xmlns='jabber:server' xmlns:db='jabber:server:dialback' xmlns:stream='http://etherx.jabber.org/streams' id='%s' from='%s'>", session.streamid, session.to_host));
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111 if session.from_host then
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112 -- Need to perform dialback to check identity
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113 print("to: "..tostring(attr.to).." from: "..tostring(attr.from));
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114 print("Need to do dialback here you know!!");
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115 end
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116 elseif session.direction == "outgoing" then
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117 -- If we are just using the connection for verifying dialback keys, we won't try and auth it
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118 if not session.dialback_verifying then
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119 -- generate dialback key
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120 if not attr.id then error("stream response did not give us a streamid!!!"); end
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121 session.streamid = attr.id;
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122 session.dialback_key = generate_dialback(session.streamid, session.to_host, session.from_host);
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123 session.send(format("<db:result from='%s' to='%s'>%s</db:result>", session.from_host, session.to_host, session.dialback_key));
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124 session.log("info", "sent dialback key on outgoing s2s stream");
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125 else
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126 mark_connected(session);
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127 end
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128 end
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129 --[[
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130 local features = {};
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131 modulemanager.fire_event("stream-features-s2s", session, features);
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132
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133 send("<stream:features>");
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134
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135 for _, feature in ipairs(features) do
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136 send(tostring(feature));
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137 end
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138
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139 send("</stream:features>");]]
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140 log("info", "s2s stream opened successfully");
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141 session.notopen = nil;
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142 end
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143
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144 function generate_dialback(id, to, from)
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145 return md5_hash(id..to..from..dialback_secret); -- FIXME: See XEP-185 and XEP-220
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146 end
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147
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148 function verify_dialback(id, to, from, key)
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149 return key == generate_dialback(id, to, from);
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150 end
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151
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152 function make_authenticated(session)
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153 if session.type == "s2sout_unauthed" then
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154 session.type = "s2sout";
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155 elseif session.type == "s2sin_unauthed" then
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156 session.type = "s2sin";
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157 else
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158 return false;
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159 end
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160 session.log("info", "connection is now authenticated");
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161
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162 mark_connected(session);
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163
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164 return true;
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165 end
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166
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167 function mark_connected(session)
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168 local sendq, send = session.sendq, session.send;
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169 if sendq then
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170 session.log("debug", "sending queued stanzas across new connection");
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171 for _, data in ipairs(sendq) do
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172 session.log("debug", "sending: %s", tostring(data));
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173 send(data);
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174 end
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175 end
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176 end
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177
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178 return _M; |
