prosody
783056b4e448
plugins/mod_csi_simple.lua

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plugins/mod_csi_simple.lua @ 12181:783056b4e448 0.11 0.11.12

util.xml: Do not allow doctypes, comments or processing instructions Yes. This is as bad as it sounds. CVE pending. In Prosody itself, this only affects mod_websocket, which uses util.xml to parse the <open/> frame, thus allowing unauthenticated remote DoS using Billion Laughs. However, third-party modules using util.xml may also be affected by this. This commit installs handlers which disallow the use of doctype declarations and processing instructions without any escape hatch. It, by default, also introduces such a handler for comments, however, there is a way to enable comments nontheless. This is because util.xml is used to parse human-facing data, where comments are generally a desirable feature, and also because comments are generally harmless.
author Jonas Schäfer <jonas@wielicki.name>
date Mon, 10 Jan 2022 18:23:54 +0100
parent 10816:b4c2c7fae7c0
child 10817:7c503938ce1d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 -- Copyright (C) 2016-2018 Kim Alvefur
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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 module:depends"csi"
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8
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9 local jid = require "util.jid";
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10 local st = require "util.stanza";
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11 local dt = require "util.datetime";
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12 local new_queue = require "util.queue".new;
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13
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14 local function new_pump(output, ...)
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15 -- luacheck: ignore 212/self
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16 local q = new_queue(...);
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17 local flush = true;
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18 function q:pause()
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19 flush = false;
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20 end
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21 function q:resume()
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22 flush = true;
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23 return q:flush();
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24 end
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25 local push = q.push;
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26 function q:push(item)
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27 local ok = push(self, item);
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28 if not ok then
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29 q:flush();
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30 output(item, self);
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31 elseif flush then
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32 return q:flush();
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33 end
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34 return true;
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35 end
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36 function q:flush()
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37 local item = self:pop();
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38 while item do
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39 output(item, self);
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40 item = self:pop();
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41 end
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42 return true;
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43 end
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44 return q;
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45 end
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46
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47 local queue_size = module:get_option_number("csi_queue_size", 256);
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48
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49 module:hook("csi-is-stanza-important", function (event)
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50 local stanza = event.stanza;
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51 if not st.is_stanza(stanza) then
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52 return true;
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53 end
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54 local st_name = stanza.name;
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55 if not st_name then return false; end
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56 local st_type = stanza.attr.type;
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57 if st_name == "presence" then
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58 if st_type == nil or st_type == "unavailable" then
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59 return false;
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60 end
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61 return true;
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62 elseif st_name == "message" then
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63 if st_type == "headline" then
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64 return false;
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65 end
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66 if stanza:get_child("sent", "urn:xmpp:carbons:2") then
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67 return true;
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68 end
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69 local forwarded = stanza:find("{urn:xmpp:carbons:2}received/{urn:xmpp:forward:0}/{jabber:client}message");
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70 if forwarded then
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71 stanza = forwarded;
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72 end
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73 if stanza:get_child("body") then
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74 return true;
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75 end
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76 if stanza:get_child("subject") then
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77 return true;
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78 end
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79 if stanza:get_child("encryption", "urn:xmpp:eme:0") then
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80 return true;
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81 end
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82 if stanza:get_child(nil, "urn:xmpp:jingle-message:0") then
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83 return true;
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84 end
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85 return false;
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86 end
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87 return true;
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88 end, -1);
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89
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90 module:hook("csi-client-inactive", function (event)
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91 local session = event.origin;
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92 if session.pump then
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93 session.pump:pause();
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94 else
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95 local bare_jid = jid.join(session.username, session.host);
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96 local send = session.send;
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97 session._orig_send = send;
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98 local pump = new_pump(session.send, queue_size);
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99 pump:pause();
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100 session.pump = pump;
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101 function session.send(stanza)
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102 if session.state == "active" or module:fire_event("csi-is-stanza-important", { stanza = stanza, session = session }) then
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103 pump:flush();
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104 send(stanza);
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105 else
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106 if st.is_stanza(stanza) and stanza.attr.xmlns == nil and stanza.name ~= "iq" then
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107 stanza = st.clone(stanza);
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108 stanza:add_direct_child(st.stanza("delay", {xmlns = "urn:xmpp:delay", from = bare_jid, stamp = dt.datetime()}));
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109 end
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110 pump:push(stanza);
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111 end
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112 return true;
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113 end
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114 end
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115 end);
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116
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117 module:hook("csi-client-active", function (event)
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118 local session = event.origin;
aeb054ee88c5 mod_csi_simple: Import modified version of mod_csi_pump from prosody-modules
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119 if session.pump then
aeb054ee88c5 mod_csi_simple: Import modified version of mod_csi_pump from prosody-modules
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120 session.pump:resume();
aeb054ee88c5 mod_csi_simple: Import modified version of mod_csi_pump from prosody-modules
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121 end
aeb054ee88c5 mod_csi_simple: Import modified version of mod_csi_pump from prosody-modules
Kim Alvefur <zash@zash.se>
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122 end);
aeb054ee88c5 mod_csi_simple: Import modified version of mod_csi_pump from prosody-modules
Kim Alvefur <zash@zash.se>
parents:
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123