annotate mod_onions/mod_onions.lua @ 3772:22f02716819f

mod_s2s_keepalive: Isolate source host of pings The incoming_s2s table is not restricted to the current virtualhost so this prevents opening more connections than what's needed. Also prevents useless double sending of one whitespace per local host.
author Kim Alvefur <zash@zash.se>
date Mon, 23 Dec 2019 01:18:02 +0100
parents 824b0d7fa883
children 44be2c6087f3
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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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8
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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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21
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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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26
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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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32
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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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38
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39 local function socks5_connect_sent(conn, data)
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40
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41 local session = sessions[conn];
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42
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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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49
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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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80
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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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diff changeset
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
05ebe377fc90 mod_onions: Use net.server API for creating a new connection instead of duplicating socket creation
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parents: 2873
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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Thijs Alkemade <me@thijsalkema.de>
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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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diff changeset
210 reply.attr.type = "error";
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diff changeset
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