Wed, 25 Nov 2009 22:00:33 +0500
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1 | -- Copyright (C) 2009 Thilo Cestonaro |
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2 | -- |
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3 | -- This project is MIT/X11 licensed. Please see the |
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4 | -- COPYING file in the source package for more information. |
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5 | -- |
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6 | --[[ |
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7 | * to restart the proxy in the console: e.g. |
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8 | module:unload("proxy65"); |
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9 | > server.removeserver(<proxy65_port>); |
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10 | module:load("proxy65", <proxy65_jid>); |
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11 | ]]-- |
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12 | |
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13 | if module:get_host_type() ~= "component" then |
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14 | error("proxy65 should be loaded as a component, please see http://prosody.im/doc/components", 0); |
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15 | end |
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16 | |
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17 | local jid_split = require "util.jid".split; |
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18 | local st = require "util.stanza"; |
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19 | local componentmanager = require "core.componentmanager"; |
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20 | local config_get = require "core.configmanager".get; |
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21 | local connlisteners = require "net.connlisteners"; |
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22 | local sha1 = require "util.hashes".sha1; |
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23 | |
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24 | local host, name = module:get_host(), "SOCKS5 Bytestreams Service"; |
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25 | local sessions, transfers, component, replies_cache = {}, {}, nil, {}; |
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26 | |
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27 | local proxy_port = config_get(host, "core", "proxy65_port") or 5000; |
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28 | local proxy_interface = config_get(host, "core", "proxy65_interface") or "*"; |
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29 | local proxy_address = config_get(host, "core", "proxy65_address") or (proxy_interface ~= "*" and proxy_interface) or host; |
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30 | local proxy_acl = config_get(host, "core", "proxy65_acl"); |
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31 | |
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32 | local connlistener = { default_port = proxy_port, default_interface = proxy_interface, default_mode = "*a" }; |
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33 | |
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34 | function connlistener.listener(conn, data) |
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35 | local session = sessions[conn] or {}; |
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36 | |
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37 | if session.setup == nil and data ~= nil and data:sub(1):byte() == 0x05 and data:len() > 2 then |
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38 | local nmethods = data:sub(2):byte(); |
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39 | local methods = data:sub(3); |
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40 | local supported = false; |
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41 | for i=1, nmethods, 1 do |
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42 | if(methods:sub(i):byte() == 0x00) then -- 0x00 == method: NO AUTH |
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43 | supported = true; |
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44 | break; |
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45 | end |
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46 | end |
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47 | if(supported) then |
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48 | module:log("debug", "new session found ... ") |
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49 | session.setup = true; |
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50 | sessions[conn] = session; |
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51 | conn:write(string.char(5, 0)); |
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52 | end |
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53 | return; |
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54 | end |
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55 | if session.setup then |
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56 | if session.sha ~= nil and transfers[session.sha] ~= nil then |
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57 | local sha = session.sha; |
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58 | if transfers[sha].activated == true and transfers[sha].initiator == conn and transfers[sha].target ~= nil then |
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59 | transfers[sha].target:write(data); |
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60 | return; |
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61 | end |
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62 | end |
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63 | if data ~= nil and data:len() == 0x2F and -- 40 == length of SHA1 HASH, and 7 other bytes => 47 => 0x2F |
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64 | data:sub(1):byte() == 0x05 and -- SOCKS5 has 5 in first byte |
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65 | data:sub(2):byte() == 0x01 and -- CMD must be 1 |
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66 | data:sub(3):byte() == 0x00 and -- RSV must be 0 |
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67 | data:sub(4):byte() == 0x03 and -- ATYP must be 3 |
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68 | data:sub(5):byte() == 40 and -- SHA1 HASH length must be 40 (0x28) |
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69 | data:sub(-2):byte() == 0x00 and -- PORT must be 0, size 2 byte |
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70 | data:sub(-1):byte() == 0x00 |
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71 | then |
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72 | local sha = data:sub(6, 45); -- second param is not count! it's the ending index (included!) |
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73 | if transfers[sha] == nil then |
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74 | transfers[sha] = {}; |
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75 | transfers[sha].activated = false; |
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76 | transfers[sha].target = conn; |
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77 | session.sha = sha; |
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78 | module:log("debug", "target connected ... "); |
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79 | elseif transfers[sha].target ~= nil then |
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80 | transfers[sha].initiator = conn; |
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81 | session.sha = sha; |
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82 | module:log("debug", "initiator connected ... "); |
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83 | end |
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84 | conn:write(string.char(5, 0, 0, 3, sha:len()) .. sha .. string.char(0, 0)); -- VER, REP, RSV, ATYP, BND.ADDR (sha), BND.PORT (2 Byte) |
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85 | else |
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86 | log:module("warn", "Neither data transfer nor initial connect of a participator of a transfer.") |
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87 | conn.close(); |
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88 | end |
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89 | else |
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90 | if data ~= nil then |
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91 | module:log("warn", "unknown connection with no authentication data -> closing it"); |
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92 | conn.close(); |
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93 | end |
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94 | end |
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95 | end |
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96 | |
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97 | function connlistener.disconnect(conn, err) |
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98 | local session = sessions[conn]; |
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99 | if session then |
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100 | if session.sha and transfers[session.sha] then |
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101 | local initiator, target = transfers[session.sha].initiator, transfers[session.sha].target; |
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102 | if initiator == conn and target ~= nil then |
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103 | target.close(); |
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104 | elseif target == conn and initiator ~= nil then |
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105 | initiator.close(); |
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106 | end |
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107 | transfers[session.sha] = nil; |
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108 | end |
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109 | -- Clean up any session-related stuff here |
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110 | sessions[conn] = nil; |
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111 | end |
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112 | end |
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113 | |
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114 | local function get_disco_info(stanza) |
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115 | local reply = replies_cache.disco_info; |
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116 | if reply == nil then |
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117 | reply = st.iq({type='result', from=host}):query("http://jabber.org/protocol/disco#info") |
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118 | :tag("identity", {category='proxy', type='bytestreams', name=name}):up() |
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119 | :tag("feature", {var="http://jabber.org/protocol/bytestreams"}); |
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120 | replies_cache.disco_info = reply; |
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121 | end |
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122 | |
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123 | reply.attr.id = stanza.attr.id; |
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124 | reply.attr.to = stanza.attr.from; |
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125 | return reply; |
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126 | end |
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127 | |
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128 | local function get_disco_items(stanza) |
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129 | local reply = replies_cache.disco_items; |
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130 | if reply == nil then |
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131 | reply = st.iq({type='result', from=host}):query("http://jabber.org/protocol/disco#items"); |
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132 | replies_cache.disco_items = reply; |
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133 | end |
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134 | |
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135 | reply.attr.id = stanza.attr.id; |
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136 | reply.attr.to = stanza.attr.from; |
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137 | return reply; |
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138 | end |
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139 | |
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140 | local function _jid_join(node, host, resource) |
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141 | local ret = host; |
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142 | if ret then |
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143 | if node then |
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144 | ret = node .. "@" .. ret; |
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145 | end |
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146 | if resource then |
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147 | ret = ret .. "/" .. resource; |
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148 | end |
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149 | end |
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150 | return ret; |
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151 | end |
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152 | |
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153 | local function get_stream_host(origin, stanza) |
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154 | local reply = replies_cache.stream_host; |
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155 | local err_reply = replies_cache.stream_host_err; |
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156 | local sid = stanza.tags[1].attr.sid; |
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157 | local allow = false; |
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158 | local jid_node, jid_host, jid_resource = jid_split(stanza.attr.from); |
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159 | |
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160 | if stanza.attr.from == nil then |
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161 | jid_node = origin.username; |
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162 | jid_host = origin.host; |
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163 | jid_resource = origin.resource; |
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164 | end |
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165 | |
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166 | if proxy_acl and #proxy_acl > 0 then |
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167 | if host ~= nil then -- at least a domain is needed. |
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168 | for _, acl in ipairs(proxy_acl) do |
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169 | local acl_node, acl_host, acl_resource = jid_split(acl); |
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170 | if ((acl_node ~= nil and acl_node == jid_node) or acl_node == nil) and |
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171 | ((acl_host ~= nil and acl_host == jid_host) or acl_host == nil) and |
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172 | ((acl_resource ~= nil and acl_resource == jid_resource) or acl_resource == nil) then |
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173 | allow = true; |
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174 | end |
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175 | end |
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176 | end |
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177 | else |
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178 | allow = true; |
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179 | end |
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180 | if allow == true then |
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181 | if reply == nil then |
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182 | reply = st.iq({type="result", from=host}) |
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183 | :query("http://jabber.org/protocol/bytestreams") |
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184 | :tag("streamhost", {jid=host, host=proxy_address, port=proxy_port}); |
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185 | replies_cache.stream_host = reply; |
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186 | end |
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187 | else |
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188 | module:log("warn", "Denying use of proxy for %s", tostring(_jid_join(jid_node, jid_host, jid_resource))); |
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189 | if err_reply == nil then |
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190 | err_reply = st.iq({type="error", from=host}) |
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191 | :query("http://jabber.org/protocol/bytestreams") |
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192 | :tag("error", {code='403', type='auth'}) |
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193 | :tag("forbidden", {xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'}); |
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194 | replies_cache.stream_host_err = err_reply; |
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195 | end |
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196 | reply = err_reply; |
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197 | end |
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198 | reply.attr.id = stanza.attr.id; |
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199 | reply.attr.to = stanza.attr.from; |
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200 | reply.tags[1].attr.sid = sid; |
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201 | return reply; |
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202 | end |
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203 | |
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204 | module.unload = function() |
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205 | componentmanager.deregister_component(host); |
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206 | connlisteners.deregister(module.host .. ':proxy65'); |
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207 | end |
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208 | |
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209 | local function set_activation(stanza) |
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210 | local from, to, sid, reply = nil; |
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211 | from = stanza.attr.from; |
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212 | if stanza.tags[1] ~= nil and tostring(stanza.tags[1].name) == "query" then |
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213 | if stanza.tags[1].attr ~= nil then |
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214 | sid = stanza.tags[1].attr.sid; |
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215 | end |
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216 | if stanza.tags[1].tags[1] ~= nil and tostring(stanza.tags[1].tags[1].name) == "activate" then |
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217 | to = stanza.tags[1].tags[1][1]; |
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218 | end |
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219 | end |
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220 | if from ~= nil and to ~= nil and sid ~= nil then |
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221 | reply = st.iq({type="result", from=host, to=from}); |
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222 | reply.attr.id = stanza.attr.id; |
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223 | end |
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224 | return reply, from, to, sid; |
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225 | end |
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226 | |
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227 | function handle_to_domain(origin, stanza) |
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228 | local to_node, to_host, to_resource = jid_split(stanza.attr.to); |
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229 | if to_node == nil then |
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230 | local type = stanza.attr.type; |
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231 | if type == "error" or type == "result" then return; end |
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232 | if stanza.name == "iq" and type == "get" then |
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233 | local xmlns = stanza.tags[1].attr.xmlns |
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234 | if xmlns == "http://jabber.org/protocol/disco#info" then |
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235 | origin.send(get_disco_info(stanza)); |
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236 | return true; |
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237 | elseif xmlns == "http://jabber.org/protocol/disco#items" then |
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238 | origin.send(get_disco_items(stanza)); |
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239 | return true; |
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240 | elseif xmlns == "http://jabber.org/protocol/bytestreams" then |
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241 | origin.send(get_stream_host(origin, stanza)); |
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242 | return true; |
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243 | end |
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244 | elseif stanza.name == "iq" and type == "set" then |
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245 | local reply, from, to, sid = set_activation(stanza); |
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246 | if reply ~= nil and from ~= nil and to ~= nil and sid ~= nil then |
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247 | local sha = sha1(sid .. from .. to, true); |
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248 | if transfers[sha] == nil then |
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249 | module:log("error", "transfers[sha]: nil"); |
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250 | elseif(transfers[sha] ~= nil and transfers[sha].initiator ~= nil and transfers[sha].target ~= nil) then |
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251 | origin.send(reply); |
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252 | transfers[sha].activated = true; |
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253 | end |
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254 | else |
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255 | module:log("error", "activation failed: sid: %s, initiator: %s, target: %s", tostring(sid), tostring(from), tostring(to)); |
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256 | end |
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257 | end |
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258 | end |
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259 | return; |
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260 | end |
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261 | |
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262 | if not connlisteners.register(module.host .. ':proxy65', connlistener) then |
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263 | error("mod_proxy65: Could not establish a connection listener. Check your configuration please."); |
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264 | error(" one possible cause for this would be that two proxy65 components share the same port."); |
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265 | end |
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266 | |
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267 | connlisteners.start(module.host .. ':proxy65'); |
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268 | component = componentmanager.register_component(host, handle_to_domain); |