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mod_http_oauth2: Implement stateless dynamic client registration Replaces previous explicit registration that required either the additional module mod_adhoc_oauth2_client or manually editing the database. That method was enough to have something to test with, but would not probably not scale easily. Dynamic client registration allows creating clients on the fly, which may be even easier in theory. In order to not allow basically unauthenticated writes to the database, we implement a stateless model here. per_host_key := HMAC(config -> oauth2_registration_key, hostname) client_id := JWT { client metadata } signed with per_host_key client_secret := HMAC(per_host_key, client_id) This should ensure everything we need to know is part of the client_id, allowing redirects etc to be validated, and the client_secret can be validated with only the client_id and the per_host_key. A nonce injected into the client_id JWT should ensure nobody can submit the same client metadata and retrieve the same client_secret
author Kim Alvefur <zash@zash.se>
date Fri, 03 Mar 2023 21:14:19 +0100
parents f95a1e197a07
children
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# XEP-0283: Moved

[Client] Romeo
	jid: romeo1@localhost
	password: password

[Client] RomeoNew
	jid: romeo.new@localhost
	password: password

[Client] Juliet
	jid: juliet.m@localhost
	password: password

-----

# The parties connect
Romeo connects

Romeo sends:
	<presence/>

Romeo receives:
	<presence from="${Romeo's full JID}"/>

Juliet connects

Juliet sends:
	<presence/>

Juliet receives:
	<presence from="${Juliet's full JID}"/>

RomeoNew connects

RomeoNew sends:
	<presence/>

RomeoNew receives:
	<presence from="${RomeoNew's full JID}"/>

# They add each other
Romeo sends:
	<presence type="subscribe" to="${Juliet's JID}"/>

Romeo receives:
	<presence from="${Juliet's JID}" to="${Romeo's JID}" type="unavailable"/>

Juliet receives:
	<presence type="subscribe" to="${Juliet's JID}" from="${Romeo's JID}"/>

Juliet sends:
	<presence type="subscribed" to="${Romeo's JID}"/>

Romeo receives:
	<presence from="${Juliet's full JID}" to="${Romeo's JID}">
	  <delay xmlns="urn:xmpp:delay" stamp="{scansion:any}" from="localhost"/>
	</presence>

Juliet sends:
	<presence type="subscribe" to="${Romeo's JID}"/>

Juliet receives:
	<presence from="${Romeo's JID}" to="${Juliet's JID}" type="unavailable"/>

Romeo receives:
	<presence type="subscribe" to="${Romeo's JID}" from="${Juliet's JID}"/>

Romeo sends:
	<presence type="subscribed" to="${Juliet's JID}"/>

Juliet receives:
	<presence from="${Romeo's full JID}" to="${Juliet's JID}">
	  <delay xmlns="urn:xmpp:delay" stamp="{scansion:any}" from="localhost"/>
	</presence>

Romeo receives:
	<presence from="${Juliet's full JID}" to="${Romeo's JID}">
	  <delay xmlns="urn:xmpp:delay" stamp="{scansion:any}" from="localhost"/>
	</presence>

# They request their rosters

Juliet sends:
	<iq type="get" id="roster1">
		<query xmlns='jabber:iq:roster'/>
	</iq>

Juliet receives:
	<iq type="result" id="roster1"/>

RomeoNew sends:
	<iq type="get" id="roster1">
		<query xmlns='jabber:iq:roster'/>
	</iq>

RomeoNew receives:
	<iq type="result" id="roster1"/>

# They can now talk
Juliet sends:
	<message type="chat" to="${Romeo's JID}">
	  <body>ohai</body>
	</message>

Romeo receives:
	<message type="chat" to="${Romeo's JID}" from="${Juliet's full JID}">
	  <body>ohai</body>
	</message>

# Romeo moves to a new account

# Romeo publishes a moved statement

Romeo sends:
	<iq type='set' id='pub1'>
		<pubsub xmlns='http://jabber.org/protocol/pubsub'>
			<publish node='urn:xmpp:moved:1'>
				<item id='current'>
					<moved xmlns='urn:xmpp:moved:1'>
						<new-jid>${RomeoNew's JID}</new-jid>
					</moved>
				</item>
			</publish>
			<publish-options>
				<x xmlns='jabber:x:data' type='submit'>
					<field var='FORM_TYPE' type='hidden'>
						<value>http://jabber.org/protocol/pubsub#publish-options</value>
					</field>
					<field var='pubsub#access_model'>
						<value>open</value>
					</field>
				</x>
			</publish-options>
		</pubsub>
	</iq>

Romeo receives:
	<iq type="result" id="pub1">
		<pubsub xmlns='http://jabber.org/protocol/pubsub'>
			<publish node='urn:xmpp:moved:1'>
				<item id='current'/>
			</publish>
		</pubsub>
	</iq>



# RomeoNew sends moved notification to Juliet
RomeoNew sends:
	<presence type="subscribe" to="${Juliet's JID}">
		<moved xmlns="urn:xmpp:moved:1">
			<old-jid>${Romeo's JID}</old-jid>
		</moved>
	</presence>

RomeoNew receives:
	<iq type='set' id="{scansion:any}">
		<query ver="{scansion:any}" xmlns='jabber:iq:roster'>
			<item jid="${Juliet's JID}" subscription='none' ask='subscribe'/>
		</query>
	</iq>

# Juliet's server verifies and approves the subscription request

RomeoNew receives:
	<presence type="subscribed" from="${Juliet's JID}"/>

RomeoNew receives:
	<iq type='set' id="{scansion:any}">
		<query ver="{scansion:any}" xmlns='jabber:iq:roster'>
			<item jid="${Juliet's JID}" subscription='to' />
		</query>
	</iq>

# Juliet's server notifies her via a roster push

Juliet receives:
	<iq type="set" id="{scansion:any}">
		<query xmlns='jabber:iq:roster' ver='{scansion:any}'>
			<item jid="${RomeoNew's JID}" subscription='from'/>
		</query>
	</iq>