annotate mod_onions/mod_onions.lua @ 5292:231d9cc750d9

mod_http_admin_api: Fix types of numbers in openapi spec Numbers are just 'number' in both JSON Schema and Lua
author Kim Alvefur <zash@zash.se>
date Thu, 30 Mar 2023 12:05:05 +0200
parents fa415cd9eeca
children
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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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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fa415cd9eeca mod_onions: Fix for bitop with Lua 5.4
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13 local bit = assert(softreq "bit" or softreq "bit32" or softreq "util.bitcompat", "No bit module found. See https://prosody.im/doc/depends#bitop");
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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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19 local byte = string.byte;
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20 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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22 module:depends("s2s");
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23
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24 local proxy_ip = module:get_option_string("onions_socks5_host", "127.0.0.1");
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25 local proxy_port = module:get_option_number("onions_socks5_port", 9050);
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26 local forbid_else = module:get_option_boolean("onions_only", false);
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27 local torify_all = module:get_option_boolean("onions_tor_all", false);
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28 local onions_map = module:get_option("onions_map", {});
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30 local sessions = module:shared("sessions");
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32 -- The socks5listener handles connection while still connecting to the proxy,
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33 -- then it hands them over to the normal listener (in mod_s2s)
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34 local socks5listener = { default_port = proxy_port, default_mode = "*a", default_interface = "*" };
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36 local function socks5_connect_sent(conn, data)
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38 local session = sessions[conn];
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40 if #data < 5 then
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41 session.socks5_buffer = data;
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42 return;
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43 end
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44
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45 local request_status = byte(data, 2);
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47 if not request_status == 0x00 then
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48 module:log("debug", "Failed to connect to the SOCKS5 proxy. :(");
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49 session:close(false);
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50 return;
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51 end
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52
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53 module:log("debug", "Successfully connected to SOCKS5 proxy.");
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54
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55 local response = byte(data, 4);
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57 if response == 0x01 then
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58 if #data < 10 then
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59 -- let's try again when we have enough
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60 session.socks5_buffer = data;
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61 return;
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62 end
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63
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64 -- this means the server tells us to connect on an IPv4 address
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65 local ip = string.format("%d.%d.%d.%d", byte(data, 5,8));
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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: %s:%d", ip, port);
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68
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69 if not (ip == "0.0.0.0" 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.version = 1;
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88
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89 session.sends2s = function (t)
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90 log("debug", "sending (s2s over socks5): %s", (t.top_tag and t:top_tag()) or t:match("^[^>]*>?"));
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91 if t.name then
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92 t = filter("stanzas/out", t);
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93 end
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94 if t then
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95 t = filter("bytes/out", tostring(t));
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96 if t then
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97 return conn:write(tostring(t));
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98 end
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99 end
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100 end
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101
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102 session.open_stream = function ()
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103 session.sends2s(st.stanza("stream:stream", {
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104 xmlns='jabber:server', ["xmlns:db"]='jabber:server:dialback',
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105 ["xmlns:stream"]='http://etherx.jabber.org/streams',
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106 from=session.from_host, to=session.to_host, version='1.0', ["xml:lang"]='en'}):top_tag());
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diff changeset
107 end
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108
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109 conn.setlistener(conn, listener);
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110
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diff changeset
111 listener.register_outgoing(conn, session);
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112
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diff changeset
113 listener.onconnect(conn);
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114 end
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115 end
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116
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117 local function socks5_handshake_sent(conn, data)
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118
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119 local session = sessions[conn];
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120
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121 if #data < 2 then
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122 session.socks5_buffer = data;
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123 return;
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124 end
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125
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126 -- version, method
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127 local request_status = byte(data, 2);
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128
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129 module:log("debug", "SOCKS version: "..byte(data, 1));
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130 module:log("debug", "Response: "..request_status);
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131
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132 if not request_status == 0x00 then
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133 module:log("debug", "Failed to connect to the SOCKS5 proxy. :( It seems to require authentication.");
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134 session:close(false);
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135 return;
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136 end
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137
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138 module:log("debug", "Sending connect message.");
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139
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140 -- version 5, connect, (reserved), type: domainname, (length, hostname), port
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Thijs Alkemade <me@thijsalkema.de>
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141 conn:write(c(5) .. c(1) .. c(0) .. c(3) .. c(#session.socks5_to) .. session.socks5_to);
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142 conn:write(c(rshift(session.socks5_port, 8)) .. c(band(session.socks5_port, 0xff)));
1060
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143
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144 session.socks5_handler = socks5_connect_sent;
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145 end
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146
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147 function socks5listener.onconnect(conn)
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148 module:log("debug", "Connected to SOCKS5 proxy, sending SOCKS5 handshake.");
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149
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150 -- Socks version 5, 1 method, no auth
1299
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Thijs Alkemade <me@thijsalkema.de>
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151 conn:write(c(5) .. c(1) .. c(0));
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152
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153 sessions[conn].socks5_handler = socks5_handshake_sent;
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154 end
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155
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156 function socks5listener.register_outgoing(conn, session)
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157 session.direction = "outgoing";
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158 sessions[conn] = session;
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159 end
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160
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161 function socks5listener.ondisconnect(conn, err)
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162 sessions[conn] = nil;
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163 end
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164
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165 function socks5listener.onincoming(conn, data)
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166 local session = sessions[conn];
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167
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168 if session.socks5_buffer then
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169 data = session.socks5_buffer .. data;
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170 end
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171
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172 if session.socks5_handler then
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diff changeset
173 session.socks5_handler(conn, data);
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174 end
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175 end
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176
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177 local function connect_socks5(host_session, connect_host, connect_port)
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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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diff changeset
181 -- this is not necessarily the same as .to_host (it can be that this is from the onions_map)
1060
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182 host_session.socks5_to = connect_host;
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183 host_session.socks5_port = connect_port;
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184
2880
05ebe377fc90 mod_onions: Use net.server API for creating a new connection instead of duplicating socket creation
Kim Alvefur <zash@zash.se>
parents: 2873
diff changeset
185 local conn = addclient(proxy_ip, proxy_port, socks5listener, "*a");
1060
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186
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187 socks5listener.register_outgoing(conn, host_session);
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188
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189 host_session.conn = conn;
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190 end
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191
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Thijs Alkemade <me@thijsalkema.de>
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diff changeset
192 local bouncy_stanzas = { message = true, presence = true, iq = true };
1060
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193 local function bounce_sendq(session, reason)
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194 local sendq = session.sendq;
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195 if not sendq then return; end
1780
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diff changeset
196 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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197 local dummy = {
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198 type = "s2sin";
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199 send = function(s)
2881
824b0d7fa883 mod_onions: Fix unqualified use of debug.traceback
Kim Alvefur <zash@zash.se>
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diff changeset
200 (session.log or log)("error", "Replying to to an s2s error reply, please report this! Traceback: %s", debug.traceback());
1060
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201 end;
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202 dummy = true;
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203 };
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diff changeset
204 for i, data in ipairs(sendq) do
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205 local reply = data[2];
1780
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Thijs Alkemade <me@thijsalkema.de>
parents: 1617
diff changeset
206 if reply and not(reply.attr.xmlns) and bouncy_stanzas[reply.name] then
1060
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diff changeset
207 reply.attr.type = "error";
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208 reply:tag("error", {type = "cancel"})
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209 :tag("remote-server-not-found", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"}):up();
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parents:
diff changeset
210 if reason then
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Thijs Alkemade <me@thijsalkema.de>
parents:
diff changeset
211 reply:tag("text", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"})
1780
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Thijs Alkemade <me@thijsalkema.de>
parents: 1617
diff changeset
212 :text("Server-to-server connection failed: "..reason):up();
1060
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213 end
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214 core_process_stanza(dummy, reply);
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215 end
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216 sendq[i] = nil;
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217 end
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218 session.sendq = nil;
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219 end
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220 -- Try to intercept anything to *.onion
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221 local function route_to_onion(event)
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222 local stanza = event.stanza;
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223 local to_host = event.to_host;
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224 local onion_host = nil;
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225 local onion_port = nil;
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226
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227 if not to_host:find("%.onion$") then
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228 if onions_map[to_host] then
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229 if type(onions_map[to_host]) == "string" then
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230 onion_host = onions_map[to_host];
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231 else
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232 onion_host = onions_map[to_host].host;
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233 onion_port = onions_map[to_host].port;
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234 end
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235 elseif forbid_else then
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236 module:log("debug", event.to_host .. " is not an onion. Blocking it.");
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237 return false;
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238 elseif not torify_all then
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239 return;
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240 end
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241 end
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242
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243 module:log("debug", "Onion routing something to ".. to_host);
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244
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245 if hosts[event.from_host].s2sout[to_host] then
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246 return;
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247 end
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248
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249 local host_session = s2s_new_outgoing(event.from_host, to_host);
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250
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251 host_session.bounce_sendq = bounce_sendq;
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252 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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253
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diff changeset
254 hosts[event.from_host].s2sout[to_host] = host_session;
1060
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255
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diff changeset
256 connect_socks5(host_session, onion_host or to_host, onion_port or 5269);
1060
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257
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258 return true;
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259 end
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260
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261 module:log("debug", "Onions ready and loaded");
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262
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7db4d3f5fb73 mod_onions: Hook event using moduleapi
Kim Alvefur <zash@zash.se>
parents: 2304
diff changeset
263 module:hook("route/remote", route_to_onion, 200);
2306
ad40c094e7d7 mod_onions: Prevent s2s_secure_auth policy enforcement from rejecting .onion connections
Kim Alvefur <zash@zash.se>
parents: 2305
diff changeset
264
ad40c094e7d7 mod_onions: Prevent s2s_secure_auth policy enforcement from rejecting .onion connections
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diff changeset
265 module:hook_global("s2s-check-certificate", function (event)
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diff changeset
266 local host = event.host;
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parents: 2305
diff changeset
267 if host and host:find("%.onion$") then
4908
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Matthew Wild <mwild1@gmail.com>
parents: 2881
diff changeset
268 -- This cancels the event chain without reporting any cert
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269 -- validation results. The connection will typically proceed
44be2c6087f3 mod_onions: Add comment explaining s2s-check-certificate handler
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270 -- to auth using dialback.
2306
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diff changeset
271 return true;
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Kim Alvefur <zash@zash.se>
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diff changeset
272 end
ad40c094e7d7 mod_onions: Prevent s2s_secure_auth policy enforcement from rejecting .onion connections
Kim Alvefur <zash@zash.se>
parents: 2305
diff changeset
273 end);
ad40c094e7d7 mod_onions: Prevent s2s_secure_auth policy enforcement from rejecting .onion connections
Kim Alvefur <zash@zash.se>
parents: 2305
diff changeset
274