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https://github.com/moparisthebest/xeps
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XEP-0389: overhaul document structure
This also adds more information to the <success> element to make flows where the server assigns the JID possible.
This commit is contained in:
Sam Whited
parent
a8b67624ac
commit
ae5f2c7ade
284
xep-0389.xml
284
xep-0389.xml
@ -31,6 +31,19 @@
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<supersededby/>
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<shortname>ibr2</shortname>
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&sam;
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<revision>
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<version>0.5.0</version>
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<date>2020-05-26</date>
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<initials>ssw</initials>
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<remark>
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<ul>
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<li>Overhaul document for readability.</li>
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<li>Add JID and username information to success element.</li>
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<li>Always require disco/caps feature.</li>
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<li>More examples.</li>
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</ul>
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</remark>
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</revision>
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<revision>
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<version>0.4.0</version>
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<date>2020-04-22</date>
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@ -209,7 +222,7 @@
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…
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</query>]]></example>
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</section1>
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<section1 topic='Registration Flows' anchor='flows'>
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<section1 topic='Flows' anchor='flows'>
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<p>
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Registration or recovery is completed after responding to a series of
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challenges issued by the server.
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@ -223,15 +236,16 @@
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<section2 topic='Stream Feature'>
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<p>
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If a server supports registering for or recovering an account using
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Extensible IBR, it MUST inform the connecting client when returning stream
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features during the stream negotiation process.
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Extensible IBR during stream negotiation, it MUST inform the connecting
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client when returning stream features during the stream negotiation process.
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This is done by including a <register/> element, qualified by the
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'urn:xmpp:register:0' namespace for account registration, or a
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<recovery/> element qualified by the same namespace for account
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recovery.
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The register and recovery features are always voluntary-to-negotiate.
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The registration and recovery features MUST NOT be advertised before
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encryption has been negotiated, eg. using direct TLS or opportunistic TLS.
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The registration and recovery features MUST NOT be advertised before a
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security layer has been negotiated, eg. using direct TLS or opportunistic
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TLS.
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They SHOULD be advertised at the same time as the SASL authentication
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feature, meaning that after registration or recovery is completed SASL
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authentication can proceed.
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@ -244,15 +258,17 @@
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workflow that only contains challenges which the client supports.
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Each <flow/> element MUST have a unique "id" attribute which is used
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by the client to identify the flow being selected.
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They must also have at least one <name/> element containing a short,
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The id attribute is only used during this particular flow negotiation and
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has no meaning after a flow has been selected.
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Flows must also have at least one <name/> element containing a short,
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human readable description of the flow.
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If multiple <name/> elements are present they MUST have unique values
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for the "xml:lang" attribute.
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Clients MAY use the name element to show the different flows to the user and
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ask them to pick between them.
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Each flow must also contain an unordered set of <challenge/> elements
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representing the various challenges that must be completed to complete the
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registration or recovery flow.
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Each flow element must also contain an unordered set of <challenge/>
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elements representing the various challenge types that may be required to
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complete the registration or recovery flow.
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Each <challenge/> element contains a "type" attribute that uniquely
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identifies the challenge for the purpose of determining if it is supported.
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If a flow would offer the same challenge twice (eg. two data forms asking
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@ -296,7 +312,18 @@
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</recovery>
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</stream:features>]]></example>
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</section2>
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<p>
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Just because a challenge type is listed by the server in the initial flow
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element does not mean that it will be issued by the server.
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Servers MAY choose to issue more or fewer challenges based on the result of
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previous challenges and may not use every challenge type listed in the
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original flow.
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</p>
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<section2 topic='Retrieving the Flows'>
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<p>
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Registration or recovery may also be completed after stream neogtiation if
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server policy allows it.
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</p>
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<p>
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To find what flows an entity provides (if any) after stream negotiation is
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complete the requester can send an IQ of type "get" containing a
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@ -309,7 +336,7 @@
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</iq>]]></example>
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<p>
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When responding to a query for registration or recovery flows the list of
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challenges should be included just as it would be if during stream feature
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challenges MUST be included just as it would be during stream feature
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negotiation.
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That is, a "register" or "recovery" element containing a list of flows,
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each with an id, containing a name and a list of challenges.
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@ -333,67 +360,140 @@
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</register>
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</iq>]]></example>
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<p>
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If an entity supports this specification but does not provide any flows
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after stream negotiation it MUST respond with an empty list.
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If an entity supports issuing challenges but does not provide any flows
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after stream negotiation is complete it MUST respond with an empty list.
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Similarly, an entity that supports this specification but does not support
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issuign challenges itself (for example, a client that only supports
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receiving challenges) it MUST respond successfully with an empty list.
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</p>
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<example caption='Empty registration flows results'><![CDATA[
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<iq type='result'>
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<register xmlns='urn:xmpp:register:0'/>
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</iq>]]></example>
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</section2>
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</section1>
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<section1 topic='Challenges' anchor='challenge'>
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<p>
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A client selects the registration or recovery feature for negotiation by
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replying with an element of the same name and namespace.
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The element MUST contain a <flow> element that MUST have an "id"
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attribute matching one of the flows advertised by the server.
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For example, to select the "Verify by Phone Call" registration flow from
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the previous example, the client would reply with:
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</p>
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<section2 topic='Issuing Challenges' anchor='challenge'>
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<p>
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A client selects the registration or recovery feature for negotiation by
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replying with an element of the same name and namespace.
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The element MUST contain a <flow> element that MUST have an "id"
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attribute matching one of the flows advertised by the server.
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For example, to select the "Verify by Phone Call" registration flow from
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the previous example, the client would reply with:
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</p>
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<example caption='Client selects a recovery flow'><![CDATA[
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<register xmlns='urn:xmpp:register:0'>
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<flow id='1'/>
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</register>]]></example>
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<p>
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If the client is initiating registration or recovery after a stream has
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already been initiated it uses the same registration element wrapped in an
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IQ of type "set".
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<p>
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If the client is initiating registration or recovery after a stream has
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already been initiated it uses the same registration element wrapped in an
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IQ of type "set".
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</p>
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<example caption='Client selects a recovery flow after stream negotiation'><![CDATA[
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<example caption='Client selects a recovery flow after stream negotiation'><![CDATA[
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<iq type='set' id='foo'>
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<recovery xmlns='urn:xmpp:register:0'>
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<flow id='0'/>
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</recovery>
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</iq>]]></example>
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<p>
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The server then replies to the IQ or feature selection with a challenge.
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If replying to an IQ, the challenge must be wrapped in an IQ of type
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"result".
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Challenges take the form of a <challenge/> element qualified by the
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'urn:xmpp:register:0' namespace with a 'type' attribute that uniquely
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identifies the type of payload a client might expect the element to contain.
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</p>
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<p>
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The server then replies to the IQ or feature selection with a challenge.
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If replying to an IQ, the challenge must be wrapped in an IQ of type
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"result".
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Challenges take the form of a <challenge/> element qualified by the
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'urn:xmpp:register:0' namespace with a 'type' attribute that uniquely
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identifies the type of payload a client might expect the element to
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contain.
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</p>
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<example caption='Server issues a challenge'><![CDATA[
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<challenge xmlns='urn:xmpp:register:0'
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type='urn:example:challenge'>
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<example xmlns='urn:example:challenge'>Payload</example>
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</challenge>]]></example>
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<p>
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After a challenge is received, the client replies to the challenge by
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sending a <response/> element qualified by the 'urn:xmpp:register:0'
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namespace or a cancellation as defined later in this document.
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If the client sends a response, it MUST also include the payload
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corresponding to the challenges 'type' element (which may be empty).
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</p>
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<p>
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After a challenge is received, the client replies to the challenge by
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sending a <response/> element qualified by the 'urn:xmpp:register:0'
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namespace or a cancellation as defined later in this document.
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If the client sends a response, it MUST also include the payload
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corresponding to the challenges 'type' element (which may be empty).
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</p>
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<example caption='Client responds to a challenge'><![CDATA[
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<response xmlns='urn:xmpp:register:0'>
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<result xmlns='urn:example:challenge'>Example Response</result>
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</response>]]></example>
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<p>
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After a response is received, if the server needs more information it MAY
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issue another challenge.
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For example, if the user has entered their email in response to a
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challenge, the server might send an email and then issue another challenge
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asking for the unique code sent in the email.
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</p>
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</section2>
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<section2 topic='Completing Registration or Recovery' anchor='completion'>
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<p>
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If after receiving a challenge or response a client or server does not
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wish to continue registration or recovery, it may send an empty
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<cancel/> element qualified by the 'urn:xmpp:register:0' namespace.
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This informs the client or server that registration is complete.
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This is the same as submitting a data form of type 'cancel' in response to
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a data form challenge.
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</p>
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<example caption='User Cancels Registration or Recovery'><![CDATA[
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<cancel xmlns='urn:xmpp:register:0'/>]]></example>
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<p>
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If the IQ based registration or recovery flow is being used and the server
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wishes to cancel the flow, it MAY respond to any IQ with the cancel
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element and type "result".
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</p>
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<example caption='Client or server cancels request'><![CDATA[
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<iq type='result' id='bar'>
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<cancel xmlns='urn:xmpp:register:0'/>
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</iq>]]></example>
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<p>
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A server may also issue a cancelation IQ with type 'set' if it wishes to
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cancel after a request/response has been received (ie. when there is no
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existing IQ to respond to).
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</p>
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<example caption='Server cancels flow'><![CDATA[
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<iq type='set' id='bar'>
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<cancel xmlns='urn:xmpp:register:0'/>
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</iq>]]></example>
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<p>
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If the client successfully completes all required challenges during stream
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negotiation the server MUST return a <success/> element qualified by
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the 'urn:xmpp:register:0' namespace, at which point it may continue with
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the stream negotiation process.
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The success element MUST contain a <jid> element containing the bare
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JID as registered or recovered by the server and a <username>
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element containing the simple user name for use with SASL (normally this
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will be the same as the localpart of the JID).
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</p>
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<example caption='Server indicates success during steam negotiation'><![CDATA[
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<success xmlns='urn:xmpp:register:0'>
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<jid>mercutio@example.net</jid>
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<username>mercutio</username>
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</success>]]></example>
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<p>
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If the IQ based flow is being used and the server wishes to indicate
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success after a challenge has been completed it sends an IQ of type "set"
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containing the <success/> element.
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</p>
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<example caption='Server indicates success after stream negotiation'><![CDATA[
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<iq type='set' id='bar'>
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<success xmlns='urn:xmpp:register:0'>
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<jid>mercutio@example.net</jid>
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<username>mercutio</username>
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</success>
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</iq>]]></example>
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</section2>
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</section1>
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<section1 topic='Challenges' anchor='challenge'>
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<p>
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This document defines several challenges that use existing technologies.
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</p>
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<section2 topic='Data Form' anchor='dataform'>
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<p>
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This document defines a type of 'jabber:x:data' which MUST always contain a
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data form (an 'x' element with type 'form') as defined by &xep0004;.
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Challenges of type 'jabber:x:data' MUST always contain a data form (an 'x'
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element with type 'form') as defined by &xep0004;.
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</p>
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<example caption='Server issues a data form challenge'><![CDATA[
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<challenge xmlns='urn:xmpp:register:0'
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@ -446,7 +546,7 @@
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</section2>
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<section2 topic='Out of Band Data' anchor='oob'>
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<p>
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Challenges of the type "jabber:x:oob" MUST contain an <x/> element
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Challenges of type "jabber:x:oob" MUST contain an <x/> element
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qualified by the "jabber:x:oob" namespace as defined in &xep0066;.
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</p>
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<example caption='Server issues an OOB challenge'><![CDATA[
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@ -462,44 +562,54 @@
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<example caption='Client acknowledges the OOB challenge'><![CDATA[
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<response xmlns='urn:xmpp:register:0'/>]]></example>
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</section2>
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</section1>
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<section1 topic='Completing Registration or Recovery' anchor='completion'>
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<p>
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If after receiving a challenge or response a client or server does not wish
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to continue registration or recovery, it may send an empty <cancel/>
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element qualified by the 'urn:xmpp:register:0' namespace.
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This informs the client or server that registration is complete.
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This is the same as submitting a data form of type 'cancel' in response to a
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data form challenge.
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</p>
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<example caption='User Cancels Registration or Recovery'><![CDATA[
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<cancel xmlns='urn:xmpp:register:0'/>]]></example>
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<p>
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If the IQ based registration or recovery flow is being used and the server
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wishes to cancel the flow, it MAY respond to any IQ from the client with the
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cancel element and type "result".
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</p>
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<example caption='Server cancels request'><![CDATA[
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<iq type='result' id='bar'>
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<cancel xmlns='urn:xmpp:register:0'/>
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</iq>]]></example>
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<p>
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If the client successfully completes all required challenges during stream
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negotiation the server MUST return an empty <success/> element
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qualified by the 'urn:xmpp:register:0' namespace, at which point it may
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continue with the stream negotiation process.
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If the server needs more information, for example, in the previous challenge
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the user entered an email and now the server wishes to ask for a code that
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was sent to that email, the server MAY send another challenge.
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</p>
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<example caption='Server indicates success during steam negotiation'><![CDATA[
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<success xmlns='urn:xmpp:register:0'/>]]></example>
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<p>
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If the IQ based flow is being used and the server wishes to indicate success
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it sends an empty IQ response of type "result".
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</p>
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<example caption='Server indicates success after stream negotiation'><![CDATA[
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<iq type='result' id='bar' />]]></example>
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<section2 topic='SASL' anchor='sasl'>
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<p>
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Servers can support changing passwords by providing a reset flow
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containing a SASL challenge.
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The SASL challenge re-uses the SASL profile from &rfc6120;.
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The server begins by sending the mechanisms list, and the client responds
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by selecting a mechanism and possibly including initial data.
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Each step in the SASL process is issued as a new SASL challenge.
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</p>
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<example caption='SASL challenge flow'><![CDATA[
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<!-- Server -->
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<challenge xmlns='urn:xmpp:register:0'
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type='urn:ietf:params:xml:ns:xmpp-sasl'>
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<mechanisms xmlns='urn:ietf:params:xml:ns:xmpp-sasl'>
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<mechanism>EXTERNAL</mechanism>
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<mechanism>SCRAM-SHA-1-PLUS</mechanism>
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<mechanism>SCRAM-SHA-1</mechanism>
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<mechanism>PLAIN</mechanism>
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</mechanisms>
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</challenge>
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<!-- Client -->
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<response xmlns='urn:xmpp:register:0'>
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<auth xmlns="urn:ietf:params:xml:ns:xmpp-sasl"
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mechanism="SCRAM-SHA-1">
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biwsbj1qdWxpZXQscj1vTXNUQUF3QUFBQU1BQUFBTlAwVEFBQUFBQUJQVTBBQQ==
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</auth>
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</response>
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<!-- Server -->
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<challenge xmlns='urn:xmpp:register:0'
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type='urn:ietf:params:xml:ns:xmpp-sasl'>
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<challenge xmlns="urn:ietf:params:xml:ns:xmpp-sasl">
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cj1vTXNUQUF3QUFBQU1BQUFBTlAwVEFBQUFBQUJQVTBBQWUxMjQ2OTViLTY5Y
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TktNGRlNi05YzMwLWI1MWIzODA4YzU5ZSxzPU5qaGtZVE0wTURndE5HWTBaaT
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AwTmpkbUxUa3hNbVV0TkRsbU5UTm1ORE5rTURNeixpPTQwOTY=
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</challenge>
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</challenge>
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<!-- Client -->
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<response xmlns='urn:xmpp:register:0'>
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<response xmlns="urn:ietf:params:xml:ns:xmpp-sasl">
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Yz1iaXdzLHI9b01zVEFBd0FBQUFNQUFBQU5QMFRBQUFBQUFCUFUwQUFlMTI0N
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jk1Yi02OWE5LTRkZTYtOWMzMC1iNTFiMzgwOGM1OWUscD1VQTU3dE0vU3ZwQV
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RCa0gyRlhzMFdEWHZKWXc9
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</response>
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</response>]]></example>
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</section2>
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</section1>
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<section1 topic='Internationalization Considerations' anchor='i18n'>
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<p>
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@ -518,10 +628,10 @@
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Servers that allow in-band registration need to take measures to prevent
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abuse.
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Common techniques to prevent spam registrations include displaying CAPTCHAs
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or requiring proof-of-possession of a valid email address or telephone number
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by sending a unique code (e.g. an HMAC that can later be verified as having
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originated at the server) to the users email and requiring that they enter
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the code before continuing.
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or requiring proof-of-possession of a valid email address or telephone
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number by sending a unique code (e.g. an HMAC that can later be verified as
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having originated at the server) to the users email and requiring that they
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enter the code before continuing.
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Servers that do not take such measures risk being black listed by other
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servers in the network.
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</p>
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