annotate mod_onions/mod_onions.lua @ 4773:eb63890ae8fc

mod_muc_offline_delivery: Allow the module to be enabled by default for all users
author Matthew Wild <mwild1@gmail.com>
date Tue, 16 Nov 2021 15:09:52 +0000 (2021-11-16)
parents 824b0d7fa883
children 44be2c6087f3
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1 local prosody = prosody;
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2 local core_process_stanza = prosody.core_process_stanza;
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3
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4 local addclient = require "net.server".addclient;
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5 local s2s_new_outgoing = require "core.s2smanager".new_outgoing;
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6 local initialize_filters = require "util.filters".initialize;
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7 local st = require "util.stanza";
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9 local portmanager = require "core.portmanager";
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10
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11 local softreq = require "util.dependencies".softreq;
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12
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13 local bit;
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14 pcall(function() bit = require"bit"; end);
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15 bit = bit or softreq"bit32"
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16 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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17
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18 local band = bit.band;
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19 local rshift = bit.rshift;
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20 local lshift = bit.lshift;
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22 local byte = string.byte;
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23 local c = string.char;
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e0d8caffa209 mod_onions: Depend on mod_s2s to avoid a traceback when loaded before mod_s2s
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25 module:depends("s2s");
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27 local proxy_ip = module:get_option_string("onions_socks5_host", "127.0.0.1");
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28 local proxy_port = module:get_option_number("onions_socks5_port", 9050);
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29 local forbid_else = module:get_option_boolean("onions_only", false);
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30 local torify_all = module:get_option_boolean("onions_tor_all", false);
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31 local onions_map = module:get_option("onions_map", {});
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33 local sessions = module:shared("sessions");
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35 -- The socks5listener handles connection while still connecting to the proxy,
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36 -- then it hands them over to the normal listener (in mod_s2s)
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37 local socks5listener = { default_port = proxy_port, default_mode = "*a", default_interface = "*" };
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39 local function socks5_connect_sent(conn, data)
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41 local session = sessions[conn];
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43 if #data < 5 then
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44 session.socks5_buffer = data;
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45 return;
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46 end
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47
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48 local request_status = byte(data, 2);
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50 if not request_status == 0x00 then
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51 module:log("debug", "Failed to connect to the SOCKS5 proxy. :(");
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52 session:close(false);
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53 return;
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54 end
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55
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56 module:log("debug", "Successfully connected to SOCKS5 proxy.");
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57
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58 local response = byte(data, 4);
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59
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60 if response == 0x01 then
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61 if #data < 10 then
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62 -- let's try again when we have enough
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63 session.socks5_buffer = data;
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64 return;
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65 end
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66
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67 -- this means the server tells us to connect on an IPv4 address
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68 local ip = string.format("%d.%d.%d.%d", byte(data, 5,8));
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69 local port = band(byte(data, 9), lshift(byte(data, 10), 8));
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70 module:log("debug", "Should connect to: %s:%d", ip, port);
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71
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72 if not (ip == "0.0.0.0" and port == 0) then
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73 module:log("debug", "The SOCKS5 proxy tells us to connect to a different IP, don't know how. :(");
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74 session:close(false);
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75 return;
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76 end
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77
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78 -- Now the real s2s listener can take over the connection.
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79 local listener = portmanager.get_service("s2s").listener;
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81 module:log("debug", "SOCKS5 done, handing over listening to "..tostring(listener));
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82
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83 session.socks5_handler = nil;
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84 session.socks5_buffer = nil;
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85
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86 local w, log = conn.send, session.log;
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87
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88 local filter = initialize_filters(session);
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89
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90 session.version = 1;
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91
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92 session.sends2s = function (t)
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93 log("debug", "sending (s2s over socks5): %s", (t.top_tag and t:top_tag()) or t:match("^[^>]*>?"));
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94 if t.name then
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95 t = filter("stanzas/out", t);
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96 end
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97 if t then
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98 t = filter("bytes/out", tostring(t));
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99 if t then
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100 return conn:write(tostring(t));
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101 end
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102 end
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103 end
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104
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105 session.open_stream = function ()
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106 session.sends2s(st.stanza("stream:stream", {
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107 xmlns='jabber:server', ["xmlns:db"]='jabber:server:dialback',
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diff changeset
108 ["xmlns:stream"]='http://etherx.jabber.org/streams',
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diff changeset
109 from=session.from_host, to=session.to_host, version='1.0', ["xml:lang"]='en'}):top_tag());
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diff changeset
110 end
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111
1060
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112 conn.setlistener(conn, listener);
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113
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114 listener.register_outgoing(conn, session);
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115
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116 listener.onconnect(conn);
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117 end
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118 end
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119
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120 local function socks5_handshake_sent(conn, data)
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121
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122 local session = sessions[conn];
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123
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124 if #data < 2 then
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125 session.socks5_buffer = data;
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126 return;
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127 end
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128
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129 -- version, method
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130 local request_status = byte(data, 2);
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131
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132 module:log("debug", "SOCKS version: "..byte(data, 1));
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133 module:log("debug", "Response: "..request_status);
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134
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135 if not request_status == 0x00 then
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136 module:log("debug", "Failed to connect to the SOCKS5 proxy. :( It seems to require authentication.");
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137 session:close(false);
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138 return;
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139 end
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140
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141 module:log("debug", "Sending connect message.");
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142
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143 -- version 5, connect, (reserved), type: domainname, (length, hostname), port
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Thijs Alkemade <me@thijsalkema.de>
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144 conn:write(c(5) .. c(1) .. c(0) .. c(3) .. c(#session.socks5_to) .. session.socks5_to);
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145 conn:write(c(rshift(session.socks5_port, 8)) .. c(band(session.socks5_port, 0xff)));
1060
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146
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147 session.socks5_handler = socks5_connect_sent;
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148 end
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149
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150 function socks5listener.onconnect(conn)
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151 module:log("debug", "Connected to SOCKS5 proxy, sending SOCKS5 handshake.");
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152
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153 -- Socks version 5, 1 method, no auth
1299
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Thijs Alkemade <me@thijsalkema.de>
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154 conn:write(c(5) .. c(1) .. c(0));
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155
1060
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156 sessions[conn].socks5_handler = socks5_handshake_sent;
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157 end
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158
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159 function socks5listener.register_outgoing(conn, session)
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160 session.direction = "outgoing";
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161 sessions[conn] = session;
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162 end
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163
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164 function socks5listener.ondisconnect(conn, err)
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165 sessions[conn] = nil;
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166 end
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167
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168 function socks5listener.onincoming(conn, data)
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169 local session = sessions[conn];
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170
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171 if session.socks5_buffer then
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172 data = session.socks5_buffer .. data;
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173 end
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174
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diff changeset
175 if session.socks5_handler then
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176 session.socks5_handler(conn, data);
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177 end
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178 end
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179
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180 local function connect_socks5(host_session, connect_host, connect_port)
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181
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182 module:log("debug", "Connecting to " .. connect_host .. ":" .. connect_port);
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183
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diff changeset
184 -- this is not necessarily the same as .to_host (it can be that this is from the onions_map)
1060
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diff changeset
185 host_session.socks5_to = connect_host;
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186 host_session.socks5_port = connect_port;
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187
2880
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diff changeset
188 local conn = addclient(proxy_ip, proxy_port, socks5listener, "*a");
1060
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189
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190 socks5listener.register_outgoing(conn, host_session);
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191
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192 host_session.conn = conn;
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193 end
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194
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diff changeset
195 local bouncy_stanzas = { message = true, presence = true, iq = true };
1060
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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));
1060
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200 local dummy = {
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201 type = "s2sin";
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diff changeset
202 send = function(s)
2881
824b0d7fa883 mod_onions: Fix unqualified use of debug.traceback
Kim Alvefur <zash@zash.se>
parents: 2880
diff changeset
203 (session.log or log)("error", "Replying to to an s2s error reply, please report this! Traceback: %s", debug.traceback());
1060
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204 end;
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205 dummy = true;
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206 };
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diff changeset
207 for i, data in ipairs(sendq) do
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208 local reply = data[2];
1780
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diff changeset
209 if reply and not(reply.attr.xmlns) and bouncy_stanzas[reply.name] then
1060
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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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Thijs Alkemade <me@thijsalkema.de>
parents:
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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 -- Try to intercept anything to *.onion
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224 local function route_to_onion(event)
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225 local stanza = event.stanza;
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226 local to_host = event.to_host;
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227 local onion_host = nil;
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228 local onion_port = nil;
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229
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230 if not to_host:find("%.onion$") then
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231 if onions_map[to_host] then
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232 if type(onions_map[to_host]) == "string" then
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233 onion_host = onions_map[to_host];
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234 else
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235 onion_host = onions_map[to_host].host;
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236 onion_port = onions_map[to_host].port;
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237 end
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238 elseif forbid_else then
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239 module:log("debug", event.to_host .. " is not an onion. Blocking it.");
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240 return false;
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241 elseif not torify_all then
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242 return;
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243 end
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244 end
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245
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246 module:log("debug", "Onion routing something to ".. to_host);
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247
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248 if hosts[event.from_host].s2sout[to_host] then
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249 return;
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250 end
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251
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252 local host_session = s2s_new_outgoing(event.from_host, to_host);
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253
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254 host_session.bounce_sendq = bounce_sendq;
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255 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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256
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257 hosts[event.from_host].s2sout[to_host] = host_session;
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258
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259 connect_socks5(host_session, onion_host or to_host, onion_port or 5269);
1060
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260
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261 return true;
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262 end
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263
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264 module:log("debug", "Onions ready and loaded");
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265
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diff changeset
266 module:hook("route/remote", route_to_onion, 200);
2306
ad40c094e7d7 mod_onions: Prevent s2s_secure_auth policy enforcement from rejecting .onion connections
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diff changeset
267
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268 module:hook_global("s2s-check-certificate", function (event)
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269 local host = event.host;
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270 if host and host:find("%.onion$") then
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271 return true;
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272 end
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273 end);
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diff changeset
274