prosody
4585fe53e21f
plugins/mod_carbons.lua

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plugins/mod_carbons.lua @ 10794:4585fe53e21f

MUC: Enforce strict resourceprep when registering room nicknames If nickname enforcement is enabled this would otherwise let you bypass the join check in muc.lib by registering an invalid nickname and then joining with any nickname, letting register.lib change it to the invalid registered nick.
author Kim Alvefur <zash@zash.se>
date Sat, 02 May 2020 20:12:41 +0200
parent 10786:a1b633ba9bd9
child 10802:c11f9cd6c761
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 -- XEP-0280: Message Carbons implementation for Prosody
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2 -- Copyright (C) 2011-2016 Kim Alvefur
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3 --
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4 -- This file is MIT/X11 licensed.
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5
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6 local st = require "util.stanza";
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7 local jid_bare = require "util.jid".bare;
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8 local xmlns_carbons = "urn:xmpp:carbons:2";
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9 local xmlns_forward = "urn:xmpp:forward:0";
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10 local full_sessions, bare_sessions = prosody.full_sessions, prosody.bare_sessions;
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11
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12 local function toggle_carbons(event)
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13 local origin, stanza = event.origin, event.stanza;
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14 local state = stanza.tags[1].name;
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15 module:log("debug", "%s %sd carbons", origin.full_jid, state);
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16 origin.want_carbons = state == "enable" and stanza.tags[1].attr.xmlns;
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17 origin.send(st.reply(stanza));
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18 return true;
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19 end
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20 module:hook("iq-set/self/"..xmlns_carbons..":disable", toggle_carbons);
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21 module:hook("iq-set/self/"..xmlns_carbons..":enable", toggle_carbons);
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22
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23 local function should_copy(stanza, c2s, user_bare)
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24 local st_type = stanza.attr.type or "normal";
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25 if stanza:get_child("private", xmlns_carbons) then
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26 return false, "private";
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27 end
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28
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29 if stanza:get_child("no-copy", "urn:xmpp:hints") then
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30 return false, "hint";
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31 end
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32
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33 if not c2s and stanza.attr.to ~= user_bare and stanza:get_child("x", "http://jabber.org/protocol/muc#user") then
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34 -- MUC PMs are normally sent to full JIDs
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35 return false, "muc-pm";
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36 end
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37
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38 if st_type == "chat" then
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39 return true, "type";
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40 end
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41
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42 if st_type == "normal" and stanza:get_child("body") then
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43 return true, "type";
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44 end
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45
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46 if st_type == "error" and not c2s and not (stanza.attr.from or ""):find("/") then
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47 return true, "bounce";
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48 end
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49
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50 for archived in stanza:childtags("stanza-id", "urn:xmpp:sid:0") do
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51 if archived and archived.attr.by == user_bare then
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52 return true, "archived";
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53 end
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54 end
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55
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56 return false, "default";
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57 end
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58
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59 local function message_handler(event, c2s)
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60 local origin, stanza = event.origin, event.stanza;
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61 local orig_type = stanza.attr.type or "normal";
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62 local orig_from = stanza.attr.from;
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63 local bare_from = jid_bare(orig_from);
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64 local orig_to = stanza.attr.to;
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65 local bare_to = jid_bare(orig_to);
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66
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67 -- Stanza sent by a local client
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68 local bare_jid = bare_from; -- JID of the local user
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69 local target_session = origin;
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70 local top_priority = false;
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71 local user_sessions = bare_sessions[bare_from];
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72
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73 -- Stanza about to be delivered to a local client
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74 if not c2s then
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75 bare_jid = bare_to;
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76 target_session = full_sessions[orig_to];
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77 user_sessions = bare_sessions[bare_jid];
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78 if not target_session and user_sessions then
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79 -- The top resources will already receive this message per normal routing rules,
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80 -- so we are going to skip them in order to avoid sending duplicated messages.
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81 local top_resources = user_sessions.top_resources;
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82 top_priority = top_resources and top_resources[1].priority
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83 end
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84 end
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85
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86 if not user_sessions then
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87 module:log("debug", "Skip carbons for offline user");
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88 return -- No use in sending carbons to an offline user
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89 end
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90
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91 local should, why = should_copy(stanza, c2s, bare_jid);
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92
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93 if not should then
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94 module:log("debug", "Not copying stanza: %s (%s)", stanza:top_tag(), why);
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95 if why == "private" and not c2s then
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96 stanza:maptags(function(tag)
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97 if not ( tag.attr.xmlns == xmlns_carbons and tag.name == "private" ) then
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98 return tag;
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99 end
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100 end);
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101 end
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102 return;
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103 end
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104
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105 local carbon;
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106 user_sessions = user_sessions and user_sessions.sessions;
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107 for _, session in pairs(user_sessions) do
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108 -- Carbons are sent to resources that have enabled it
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109 if session.want_carbons
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110 -- but not the resource that sent the message, or the one that it's directed to
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111 and session ~= target_session
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112 -- and isn't among the top resources that would receive the message per standard routing rules
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113 and (c2s or session.priority ~= top_priority) then
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114 if not carbon then
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115 -- Create the carbon copy and wrap it as per the Stanza Forwarding XEP
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116 local copy = st.clone(stanza);
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117 if c2s and not orig_to then
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118 stanza.attr.to = bare_from;
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119 end
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120 copy.attr.xmlns = "jabber:client";
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121 carbon = st.message{ from = bare_jid, type = orig_type, }
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122 :tag(c2s and "sent" or "received", { xmlns = xmlns_carbons })
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123 :tag("forwarded", { xmlns = xmlns_forward })
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124 :add_child(copy):reset();
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125
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126 end
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127
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128 carbon.attr.to = session.full_jid;
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129 module:log("debug", "Sending carbon to %s", session.full_jid);
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130 session.send(carbon);
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131 end
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132 end
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133 end
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134
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135 local function c2s_message_handler(event)
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136 return message_handler(event, true)
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137 end
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138
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139 -- Stanzas sent by local clients
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140 module:hook("pre-message/host", c2s_message_handler, -0.5);
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141 module:hook("pre-message/bare", c2s_message_handler, -0.5);
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142 module:hook("pre-message/full", c2s_message_handler, -0.5);
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143 -- Stanzas to local clients
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144 module:hook("message/bare", message_handler, -0.5);
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145 module:hook("message/full", message_handler, -0.5);
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146
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147 module:add_feature(xmlns_carbons);