prosody-modules
259ffdbf8906
mod_tcpproxy/mod_tcpproxy.lua

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mod_tcpproxy/mod_tcpproxy.lua @ 5883:259ffdbf8906

mod_anti_spam: New module for spam filtering (pre-alpha)
author Matthew Wild <mwild1@gmail.com>
date Tue, 05 Mar 2024 18:26:29 +0000
parent 4853:3804332c204e
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1 local st = require "util.stanza";
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3 local xmlns_ibb = "http://jabber.org/protocol/ibb";
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4 local xmlns_tcp = "http://prosody.im/protocol/tcpproxy";
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6 local host_attr, port_attr = xmlns_tcp.."\1host", xmlns_tcp.."\1port";
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8 local base64 = require "util.encodings".base64;
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9 local b64, unb64 = base64.encode, base64.decode;
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11 local host = module.host;
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13 local open_connections = {};
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15 local function new_session(jid, sid, conn)
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16 if not open_connections[jid] then
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17 open_connections[jid] = {};
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18 end
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19 open_connections[jid][sid] = conn;
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20 end
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21 local function close_session(jid, sid)
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22 if open_connections[jid] then
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23 open_connections[jid][sid] = nil;
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24 if next(open_connections[jid]) == nil then
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25 open_connections[jid] = nil;
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26 end
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27 return true;
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28 end
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29 end
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31 function proxy_component(origin, stanza)
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32 local ibb_tag = stanza.tags[1];
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33 if (not (stanza.name == "iq" and stanza.attr.type == "set")
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34 and stanza.name ~= "message")
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35 or
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36 (not (ibb_tag)
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37 or ibb_tag.attr.xmlns ~= xmlns_ibb) then
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38 if stanza.attr.type ~= "error" then
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39 origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
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40 end
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41 return;
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42 end
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43
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44 if ibb_tag.name == "open" then
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45 -- Starting a new stream
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46 local to_host, to_port = ibb_tag.attr[host_attr], ibb_tag.attr[port_attr];
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47 local jid, sid, block_size = stanza.attr.from, ibb_tag.attr.sid, ibb_tag.attr["block-size"];
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48 if not (to_host and to_port) then
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49 origin.send(st.error_reply(stanza, "modify", "bad-request", "No host/port specified"));
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50 return true;
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51 elseif not sid or sid == "" then
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52 origin.send(st.error_reply(stanza, "modify", "bad-request", "No sid specified"));
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53 return true;
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54 elseif not block_size or not tonumber(block_size) then
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55 origin.send(st.error_reply(stanza, "modify", "bad-request", "Bad block-size attribute"));
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56 return true;
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57 elseif ibb_tag.attr.stanza ~= "message" then
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58 origin.send(st.error_reply(stanza, "modify", "bad-request", "Only 'message' stanza transport is supported"));
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59 return true;
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60 end
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61 local conn, err = socket.tcp();
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62 if not conn then
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63 origin.send(st.error_reply(stanza, "wait", "resource-constraint", err));
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64 return true;
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65 end
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66 conn:settimeout(0);
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67
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68 local success, err = conn:connect(to_host, to_port);
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69 if not success and err ~= "timeout" then
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70 origin.send(st.error_reply(stanza, "wait", "remote-server-not-found", err));
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71 return true;
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72 end
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73
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74 local listener,seq = {}, 0;
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75 function listener.onconnect(conn)
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76 origin.send(st.reply(stanza));
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77 end
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78 function listener.onincoming(conn, data)
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79 origin.send(st.message({to=jid,from=host})
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80 :tag("data", {xmlns=xmlns_ibb,seq=seq,sid=sid})
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81 :text(b64(data)));
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82 seq = seq + 1;
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83 end
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84 function listener.ondisconnect(conn, err)
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85 origin.send(st.message({to=jid,from=host})
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86 :tag("close", {xmlns=xmlns_ibb,sid=sid}));
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87 close_session(jid, sid);
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88 end
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89
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90 conn = server.wrapclient(conn, to_host, to_port, listener, "*a" );
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91 new_session(jid, sid, conn);
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92 elseif ibb_tag.name == "data" then
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93 local conn = open_connections[stanza.attr.from][ibb_tag.attr.sid];
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94 if conn then
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95 local data = unb64(ibb_tag:get_text());
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96 if data then
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97 conn:write(data);
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98 else
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99 origin.send(
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100 st.error_reply(stanza, "modify", "bad-request", "Invalid data (base64?)")
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101 );
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102 return true;
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103 end
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104 else
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105 origin.send(st.error_reply(stanza, "cancel", "item-not-found"));
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106 return true;
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107 end
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108 elseif ibb_tag.name == "close" then
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109 if close_session(stanza.attr.from, ibb_tag.attr.sid) then
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110 origin.send(st.reply(stanza));
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111 else
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112 origin.send(st.error_reply(stanza, "cancel", "item-not-found"));
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113 return true;
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114 end
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115 end
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116 end
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117
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118 local function stanza_handler(event)
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119 proxy_component(event.origin, event.stanza);
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120 return true;
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121 end
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122 module:hook("iq/bare", stanza_handler, -1);
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123 module:hook("message/bare", stanza_handler, -1);
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124 module:hook("presence/bare", stanza_handler, -1);
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125 module:hook("iq/full", stanza_handler, -1);
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126 module:hook("message/full", stanza_handler, -1);
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127 module:hook("presence/full", stanza_handler, -1);
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128 module:hook("iq/host", stanza_handler, -1);
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129 module:hook("message/host", stanza_handler, -1);
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130 module:hook("presence/host", stanza_handler, -1);
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131
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132 require "core.componentmanager".register_component(host, function() end); -- COMPAT Prosody 0.7