prosody-modules
08a0241f5d2c
mod_onions/mod_onions.lua

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mod_onions/mod_onions.lua @ 1332:08a0241f5d2c

mod_s2s_auth_dane: Add some comments
author Kim Alvefur <zash@zash.se>
date Fri, 07 Mar 2014 23:30:34 +0100
parent 1299:a7d6c6d2c7b5
child 1343:7dbde05b48a9
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 local wrapclient = require "net.server".wrapclient;
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2 local s2s_new_outgoing = require "core.s2smanager".new_outgoing;
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3 local initialize_filters = require "util.filters".initialize;
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4 local st = require "util.stanza";
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5
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6 local portmanager = require "core.portmanager";
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7
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8 local softreq = require "util.dependencies".softreq;
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9
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10 local bit;
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11 pcall(function() bit = require"bit"; end);
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12 bit = bit or softreq"bit32"
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13 if not bit then module:log("error", "No bit module found. Either LuaJIT 2, lua-bitop or Lua 5.2 is required"); end
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14
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15 local band = bit.band;
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16 local rshift = bit.rshift;
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17 local lshift = bit.lshift;
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18
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19 local byte = string.byte;
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20 local c = string.char;
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22 local proxy_ip = module:get_option("onions_socks5_host") or "127.0.0.1";
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23 local proxy_port = module:get_option("onions_socks5_port") or 9050;
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24 local forbid_else = module:get_option("onions_only") or false;
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25 local torify_all = module:get_option("onions_tor_all") or false;
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27 local sessions = module:shared("sessions");
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29 -- The socks5listener handles connection while still connecting to the proxy,
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30 -- then it hands them over to the normal listener (in mod_s2s)
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31 local socks5listener = { default_port = proxy_port, default_mode = "*a", default_interface = "*" };
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33 local function socks5_connect_sent(conn, data)
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35 local session = sessions[conn];
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36
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37 if #data < 5 then
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38 session.socks5_buffer = data;
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39 return;
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40 end
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41
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42 request_status = byte(data, 2);
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43
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44 if not request_status == 0x00 then
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45 module:log("debug", "Failed to connect to the SOCKS5 proxy. :(");
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46 session:close(false);
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47 return;
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48 end
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49
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50 module:log("debug", "Succesfully connected to SOCKS5 proxy.");
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51
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52 local response = byte(data, 4);
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54 if response == 0x01 then
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55 if #data < 10 then
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56 -- let's try again when we have enough
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57 session.socks5_buffer = data;
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58 return;
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59 end
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60
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61 -- this means the server tells us to connect on an IPv4 address
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62 local ip1 = byte(data, 5);
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63 local ip2 = byte(data, 6);
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64 local ip3 = byte(data, 7);
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65 local ip4 = byte(data, 8);
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66 local port = band(byte(data, 9), lshift(byte(data, 10), 8));
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67 module:log("debug", "Should connect to: "..ip1.."."..ip2.."."..ip3.."."..ip4..":"..port);
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68
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69 if not (ip1 == 0 and ip2 == 0 and ip3 == 0 and ip4 == 0 and port == 0) then
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70 module:log("debug", "The SOCKS5 proxy tells us to connect to a different IP, don't know how. :(");
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71 session:close(false);
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72 return;
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73 end
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74
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75 -- Now the real s2s listener can take over the connection.
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76 local listener = portmanager.get_service("s2s").listener;
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77
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78 module:log("debug", "SOCKS5 done, handing over listening to "..tostring(listener));
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79
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80 session.socks5_handler = nil;
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81 session.socks5_buffer = nil;
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82
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83 local w, log = conn.send, session.log;
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84
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85 local filter = initialize_filters(session);
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86
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87 session.sends2s = function (t)
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88 log("debug", "sending (s2s over socks5): %s", (t.top_tag and t:top_tag()) or t:match("^[^>]*>?"));
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89 if t.name then
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90 t = filter("stanzas/out", t);
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91 end
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92 if t then
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93 t = filter("bytes/out", tostring(t));
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94 if t then
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95 return conn:write(tostring(t));
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96 end
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97 end
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98 end
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99
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100 session.open_stream = function ()
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101 session.sends2s(st.stanza("stream:stream", {
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102 xmlns='jabber:server', ["xmlns:db"]='jabber:server:dialback',
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103 ["xmlns:stream"]='http://etherx.jabber.org/streams',
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diff changeset
104 from=session.from_host, to=session.to_host, version='1.0', ["xml:lang"]='en'}):top_tag());
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105 end
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106
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diff changeset
107 conn.setlistener(conn, listener);
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108
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diff changeset
109 listener.register_outgoing(conn, session);
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110
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diff changeset
111 listener.onconnect(conn);
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112 end
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diff changeset
113 end
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114
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115 local function socks5_handshake_sent(conn, data)
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116
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117 local session = sessions[conn];
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118
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119 if #data < 2 then
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120 session.socks5_buffer = data;
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121 return;
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122 end
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123
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124 -- version, method
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125 local request_status = byte(data, 2);
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126
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127 module:log("debug", "SOCKS version: "..byte(data, 1));
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128 module:log("debug", "Response: "..request_status);
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129
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130 if not request_status == 0x00 then
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131 module:log("debug", "Failed to connect to the SOCKS5 proxy. :( It seems to require authentication.");
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132 session:close(false);
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133 return;
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134 end
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135
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136 module:log("debug", "Sending connect message.");
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137
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138 -- version 5, connect, (reserved), type: domainname, (length, hostname), port
1299
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139 conn:write(c(5) .. c(1) .. c(0) .. c(3) .. c(#session.socks5_to) .. session.socks5_to);
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140 conn:write(c(rshift(session.socks5_port, 8)) .. c(band(session.socks5_port, 0xff)));
1060
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141
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142 session.socks5_handler = socks5_connect_sent;
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143 end
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144
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145 function socks5listener.onconnect(conn)
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146 module:log("debug", "Connected to SOCKS5 proxy, sending SOCKS5 handshake.");
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147
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148 -- Socks version 5, 1 method, no auth
1299
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Thijs Alkemade <me@thijsalkema.de>
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diff changeset
149 conn:write(c(5) .. c(1) .. c(0));
1060
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150
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diff changeset
151 sessions[conn].socks5_handler = socks5_handshake_sent;
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152 end
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153
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diff changeset
154 function socks5listener.register_outgoing(conn, session)
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diff changeset
155 session.direction = "outgoing";
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156 sessions[conn] = session;
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157 end
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158
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diff changeset
159 function socks5listener.ondisconnect(conn, err)
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160 sessions[conn] = nil;
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161 end
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162
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diff changeset
163 function socks5listener.onincoming(conn, data)
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164 local session = sessions[conn];
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165
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166 if session.socks5_buffer then
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diff changeset
167 data = session.socks5_buffer .. data;
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168 end
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169
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diff changeset
170 if session.socks5_handler then
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diff changeset
171 session.socks5_handler(conn, data);
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172 end
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diff changeset
173 end
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174
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diff changeset
175 local function connect_socks5(host_session, connect_host, connect_port)
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176
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177 local conn, handler = socket.tcp();
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178
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179 module:log("debug", "Connecting to " .. connect_host .. ":" .. connect_port);
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180
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parents:
diff changeset
181 -- this is not necessarily the same as .to_host (it can be that this is a SRV record)
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diff changeset
182 host_session.socks5_to = connect_host;
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diff changeset
183 host_session.socks5_port = connect_port;
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184
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185 conn:settimeout(0);
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186
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diff changeset
187 local success, err = conn:connect(proxy_ip, proxy_port);
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188
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diff changeset
189 conn = wrapclient(conn, connect_host, connect_port, socks5listener, "*a");
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190
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diff changeset
191 socks5listener.register_outgoing(conn, host_session);
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192
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diff changeset
193 host_session.conn = conn;
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194 end
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195
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diff changeset
196 local function bounce_sendq(session, reason)
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197 local sendq = session.sendq;
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198 if not sendq then return; end
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diff changeset
199 session.log("info", "sending error replies for "..#sendq.." queued stanzas because of failed outgoing connection to "..tostring(session.to_host));
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diff changeset
200 local dummy = {
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201 type = "s2sin";
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diff changeset
202 send = function(s)
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diff changeset
203 (session.log or log)("error", "Replying to to an s2s error reply, please report this! Traceback: %s", traceback());
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204 end;
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parents:
diff changeset
205 dummy = true;
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Thijs Alkemade <me@thijsalkema.de>
parents:
diff changeset
206 };
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parents:
diff changeset
207 for i, data in ipairs(sendq) do
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diff changeset
208 local reply = data[2];
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Thijs Alkemade <me@thijsalkema.de>
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diff changeset
209 if reply and not(reply.attr.xmlns) then
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Thijs Alkemade <me@thijsalkema.de>
parents:
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210 reply.attr.type = "error";
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211 reply:tag("error", {type = "cancel"})
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212 :tag("remote-server-not-found", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"}):up();
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213 if reason then
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214 reply:tag("text", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"})
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215 :text("Server-to-server connection failed: "..reason):up();
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216 end
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217 core_process_stanza(dummy, reply);
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218 end
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219 sendq[i] = nil;
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220 end
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221 session.sendq = nil;
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222 end
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223
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224 -- Try to intercept anything to *.onion
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225 local function route_to_onion(event)
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226
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227 if not event.to_host:find(".onion(.?)$") then
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228 if forbid_else then
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229 module:log("debug", event.to_host .. " is not an onion. Blocking it.");
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230 return false;
1061
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231 elseif not torify_all then
1060
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232 return;
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233 end
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234 end
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235
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236 module:log("debug", "Onion routing something to ".. event.to_host);
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237
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238 if hosts[event.from_host].s2sout[event.to_host] then
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239 return;
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240 end
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241
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242 local host_session = s2s_new_outgoing(event.from_host, event.to_host);
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243
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244 host_session.bounce_sendq = bounce_sendq;
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245 host_session.sendq = { {tostring(stanza), stanza.attr and stanza.attr.type ~= "error" and stanza.attr.type ~= "result" and st.reply(stanza)} };
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246
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247 hosts[event.from_host].s2sout[event.to_host] = host_session;
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248
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249 connect_socks5(host_session, event.to_host, 5269);
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250
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251 return true;
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252 end
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253
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254 module:log("debug", "Onions ready and loaded");
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255
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256 hosts[module.host].events.add_handler("route/remote", route_to_onion, 200);