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mod_ping_muc: Describe the client facing protocol (from XEP-0045)
author Kim Alvefur <zash@zash.se>
date Thu, 11 Jul 2024 15:14:33 +0200
parents 679f1834dbdb
children
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1 ---
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2 labels:
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3 - 'Stage-Beta'
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4 summary: 'XEP-0355 (Namespace Delegation) implementation'
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5 ...
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6
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7 Introduction
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8 ============
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9
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10 Namespace Delegation is an extension which allows server to delegate some
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11 features handling to an entity/component. Typical use case is an external PEP
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12 service, but it can be used more generally when your preferred server lack one
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13 internal feature, and you found an external component which can do it.
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14
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15 Details
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16 =======
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17
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18 You can have all the details by reading the
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19 [XEP-0355](http://xmpp.org/extensions/xep-0355.html). Only the admin mode is
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20 implemented so far.
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21
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22 Usage
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23 =====
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24
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25 To use the module, like usual add **"delegation"** to your *modules\_enabled*.
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26 Note that if you use it with a local component, you also need to activate the
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27 module in your component section:
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28
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29 modules_enabled = {
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30 [...]
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31
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32 "delegation";
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33 }
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34
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35 [...]
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36
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37 Component "youcomponent.yourdomain.tld"
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38 component_secret = "yourpassword"
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39 modules_enabled = {"delegation"}
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40
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41 then specify delegated namespaces **in your host section** like that:
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42
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43 VirtualHost "yourdomain.tld"
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44
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45 delegations = {
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46 ["urn:xmpp:mam:2"] = {
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47 filtering = {"node"};
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48 jid = "pubsub.yourdomain.tld";
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49 },
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50 ["http://jabber.org/protocol/pubsub"] = {
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51 jid = "pubsub.yourdomain.tld";
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52 },
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53 ["http://jabber.org/protocol/pubsub#owner"] = {
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54 jid = "pubsub.yourdomain.tld";
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55 },
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56 ["urn:xmpp:delegation:2:bare:disco#info:*"] = {
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57 jid = "pubsub.yourdomain.tld";
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58 },
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59 ["urn:xmpp:delegation:2:bare:disco#items:*"] = {
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60 jid = "pubsub.yourdomain.tld";
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61 },
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62
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63 }
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64
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65 Here all MAM requests with a "node" attribute (i.e. all MAM pubsub request) will
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66 be delegated to pubsub.yourdomain.tld. Similarly, all pubsub request to the host
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67 (i.e. the PEP requests) will be delegated to pubsub.yourdomain.tld. Check the
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68 XEP for the meaning of "urn:xmpp:delegation:2:bare:disco#info:*" and
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69 "urn:xmpp:delegation:2:bare:disco#items:*".
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70
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71 **/!\ Be extra careful when you give a delegation to an entity/component, it's a
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72 powerful access, only do it if you absolutely trust the component/entity, and
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73 you know where the software is coming from**
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74
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75 Configuration
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76 =============
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77
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78 The configuration is done with a table which map delegated namespace to
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79 namespace data. Namespace data MUST have a **jid** (in the form **jid =
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80 "delegated@domain.tld"**) and MAY have an additional **filtering** array. If
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81 filtering is present, request with attributes in the array will be delegated,
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82 others will be treated normally (i.e. by Prosody).
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83
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84 If you are not a developer, the delegated namespace(s)/attribute(s) are most
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85 probably specified with the external component/entity you want to use.
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86
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87 The pseudo-namespace `http://jabber.org/protocol/disco#items:*` is used to
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88 delegate remaining disco#items (i.e. items nodes not already handled by Prosody
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89 itself).
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90
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91 Compatibility
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92 =============
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93
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94 If you use it with Prosody 0.9 and a component, you need to patch
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95 core/mod\_component.lua to fire a new signal. To do it, copy the following patch
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96 in a, for example, /tmp/component.patch file:
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97
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98 diff --git a/plugins/mod_component.lua b/plugins/mod_component.lua
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99 --- a/plugins/mod_component.lua
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100 +++ b/plugins/mod_component.lua
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101 @@ -85,6 +85,7 @@
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102 session.type = "component";
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103 module:log("info", "External component successfully authenticated");
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104 session.send(st.stanza("handshake"));
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105 + module:fire_event("component-authenticated", { session = session });
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106
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107 return true;
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108 end
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109
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110 Then, at the root of prosody, enter:
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111
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112 `patch -p1 < /tmp/component.patch`
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113
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114 ----- ----------------------------------------------------
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115 0.11 Works
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116 0.10 Works
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117 0.9 Need a patched core/mod\_component.lua (see above)
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118 ----- ----------------------------------------------------
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119
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120 Note
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121 ====
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122
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123 This module is often used with mod\_privilege (c.f. XEP for more details)