prosody
b1885732e979
plugins/mod_dialback.lua

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plugins/mod_dialback.lua @ 758:b1885732e979

GPL->MIT!
author Matthew Wild <mwild1@gmail.com>
date Fri, 30 Jan 2009 17:22:56 +0000
parent 645:d0a8ff9ba3e0
child 759:5cccfb5da6cb
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1 -- Prosody IM v0.2
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2 -- Copyright (C) 2008 Matthew Wild
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3 -- Copyright (C) 2008 Waqas Hussain
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4 --
758
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
519
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7 --
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8
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9
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10
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11 local send_s2s = require "core.s2smanager".send_to_host;
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12 local s2s_make_authenticated = require "core.s2smanager".make_authenticated;
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13 local s2s_verify_dialback = require "core.s2smanager".verify_dialback;
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14 local s2s_destroy_session = require "core.s2smanager".destroy_session;
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15
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16 local st = require "util.stanza";
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17
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18 local log = require "util.logger".init("mod_dialback");
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19
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20 local xmlns_dialback = "jabber:server:dialback";
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21
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22 local dialback_requests = setmetatable({}, { __mode = 'v' });
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23
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24 module:add_handler({"s2sin_unauthed", "s2sin"}, "verify", xmlns_dialback,
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25 function (origin, stanza)
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26 -- We are being asked to verify the key, to ensure it was generated by us
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27 log("debug", "verifying dialback key...");
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28 local attr = stanza.attr;
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29 -- FIXME: Grr, ejabberd breaks this one too?? it is black and white in XEP-220 example 34
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30 --if attr.from ~= origin.to_host then error("invalid-from"); end
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31 local type;
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32 if s2s_verify_dialback(attr.id, attr.from, attr.to, stanza[1]) then
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33 type = "valid"
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34 else
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35 type = "invalid"
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36 log("warn", "Asked to verify a dialback key that was incorrect. An imposter is claiming to be %s?", attr.to);
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37 end
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38 log("debug", "verified dialback key... it is %s", type);
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39 origin.sends2s(st.stanza("db:verify", { from = attr.to, to = attr.from, id = attr.id, type = type }):text(stanza[1]));
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40 end);
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41
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42 module:add_handler({ "s2sin_unauthed", "s2sin" }, "result", xmlns_dialback,
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43 function (origin, stanza)
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44 -- he wants to be identified through dialback
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45 -- We need to check the key with the Authoritative server
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46 local attr = stanza.attr;
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47 origin.hosts[attr.from] = { dialback_key = stanza[1] };
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48
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49 if not hosts[attr.to] then
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50 -- Not a host that we serve
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51 log("info", "%s tried to connect to %s, which we don't serve", attr.from, attr.to);
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52 origin:close("host-unknown");
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53 return;
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54 end
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55
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56 dialback_requests[attr.from] = origin;
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57
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58 if not origin.from_host then
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59 -- Just used for friendlier logging
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60 origin.from_host = attr.from;
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61 end
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62 if not origin.to_host then
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63 -- Just used for friendlier logging
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64 origin.to_host = attr.to;
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65 end
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66
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67 log("debug", "asking %s if key %s belongs to them", attr.from, stanza[1]);
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68 send_s2s(attr.to, attr.from,
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69 st.stanza("db:verify", { from = attr.to, to = attr.from, id = origin.streamid }):text(stanza[1]));
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70 end);
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71
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72 module:add_handler({ "s2sout_unauthed", "s2sout" }, "verify", xmlns_dialback,
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73 function (origin, stanza)
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74 local attr = stanza.attr;
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75 local dialback_verifying = dialback_requests[attr.from];
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76 if dialback_verifying then
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77 local valid;
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78 if attr.type == "valid" then
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79 s2s_make_authenticated(dialback_verifying, attr.from);
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80 valid = "valid";
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81 else
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82 -- Warn the original connection that is was not verified successfully
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83 log("warn", "authoritative server for "..(attr.from or "(unknown)").." denied the key");
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84 valid = "invalid";
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85 end
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86 if not dialback_verifying.sends2s then
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87 log("warn", "Incoming s2s session %s was closed in the meantime, so we can't notify it of the db result", tostring(dialback_verifying):match("%w+$"));
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88 else
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89 dialback_verifying.sends2s(
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90 st.stanza("db:result", { from = attr.to, to = attr.from, id = attr.id, type = valid })
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91 :text(dialback_verifying.hosts[attr.from].dialback_key));
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92 end
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93 dialback_requests[attr.from] = nil;
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94 end
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95 end);
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96
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97 module:add_handler({ "s2sout_unauthed", "s2sout" }, "result", xmlns_dialback,
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98 function (origin, stanza)
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99 -- Remote server is telling us whether we passed dialback
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100
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101 local attr = stanza.attr;
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102 if not hosts[attr.to] then
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103 origin:close("host-unknown");
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104 return;
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105 elseif hosts[attr.to].s2sout[attr.from] ~= origin then
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106 -- This isn't right
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107 origin:close("invalid-id");
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108 return;
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109 end
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110 if stanza.attr.type == "valid" then
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111 s2s_make_authenticated(origin, attr.from);
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112 else
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113 s2s_destroy_session(origin)
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114 end
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115 end);