mirror of
https://github.com/moparisthebest/xeps
synced 2024-11-25 02:32:18 -05:00
119 lines
4.6 KiB
XML
119 lines
4.6 KiB
XML
<?xml version='1.0' encoding='UTF-8'?>
|
|
<!DOCTYPE xep SYSTEM 'xep.dtd' [
|
|
<!ENTITY rfc5056 "<span class='ref'><link url='http://tools.ietf.org/html/rfc5056'>RFC 5056</link></span> <note>RFC 5056: On the Use of Channel Bindings to Secure Channels <<link url='http://tools.ietf.org/html/rfc5056'>http://tools.ietf.org/html/rfc5056</link>>.</note>" >
|
|
<!ENTITY iana-cb-types "<span class='ref'><link url='https://www.iana.org/assignments/channel-binding-types/channel-binding-types.xhtml'>IANA Channel-Binding Types Registry</link></span> <note>IANA Channel-Binding Types Registry <<link url='https://www.iana.org/assignments/channel-binding-types/channel-binding-types.xhtml'>https://www.iana.org/assignments/channel-binding-types/channel-binding-types.xhtml</link>>.</note>" >
|
|
<!ENTITY % ents SYSTEM 'xep.ent'>
|
|
%ents;
|
|
]>
|
|
<?xml-stylesheet type='text/xsl' href='xep.xsl'?>
|
|
<xep>
|
|
<header>
|
|
<title>SASL Channel-Binding Type Capability</title>
|
|
<abstract>This specification allows servers to annouce their supported SASL channel-binding types to clients.</abstract>
|
|
&LEGALNOTICE;
|
|
<number>xxxx</number>
|
|
<status>ProtoXEP</status>
|
|
<type>Standards Track</type>
|
|
<sig>Standards</sig>
|
|
<approver>Council</approver>
|
|
<dependencies>
|
|
<spec>XMPP Core</spec>
|
|
</dependencies>
|
|
<supersedes/>
|
|
<supersededby/>
|
|
<shortname>sasl-cb-types</shortname>
|
|
&flow;
|
|
<revision>
|
|
<version>0.0.1</version>
|
|
<date>2020-05-20</date>
|
|
<initials>fs</initials>
|
|
<remark><p>First draft.</p></remark>
|
|
</revision>
|
|
</header>
|
|
<section1 topic='Introduction' anchor='intro'>
|
|
|
|
<p>SASL channel-binding is a technique to increase the security of
|
|
connections (&rfc5056;). Unfortunately, the SASL profile specified
|
|
in &rfc6120; lacks a method for the server to announce its supported
|
|
channel-binding types. This hinders the adoption of channel-binding,
|
|
especially since the error protocol to execute after a client
|
|
requested a channel-binding type unsupported by the server is
|
|
basically unspecified.</p>
|
|
|
|
<p>The extension defined herein fills the gap left by &rfc6120;, by
|
|
allowing the server the announce its supported channel-binding
|
|
types.</p>
|
|
|
|
</section1>
|
|
|
|
<section1 topic='Announcing the SASL Channel-Binding Type Capability' anchor='sasl-cb-type'>
|
|
|
|
<p>This protocol consists of a single optional extension element
|
|
named 'sasl-channel-binding' qualified by the 'urn:xmpp:sasl-cb:0'
|
|
namespace. The 'sasl-channel-binding' element MUST contain one or
|
|
more 'channel-binding' elements, of which each MUST have an
|
|
attribute with the name 'type'. The value of the 'type' attribute
|
|
SHOULD be the "Channel-binding unique prefix" of a channel-binding
|
|
type which was registered with the &iana-cb-types;.</p>
|
|
|
|
<p>A server declares that it supports particular channel-binding
|
|
types by listing the supported types via the 'sasl-channel-binding'
|
|
element defined herein. The 'sasl-channel-binding' element could
|
|
appear as child element to the SASL <mechanisms/>
|
|
stream-feature element, qualified by the
|
|
'urn:ietf:params:xml:ns:xmpp-sasl' namespace, as specified in
|
|
&rfc6120;. Another potential appearance of
|
|
<sasl-channel-binding> is as child element of the
|
|
<mechanisms/> stream-feature element as specified in the
|
|
&xep0388;.</p>
|
|
|
|
<example caption='Example <mechanisms/> stream feature with SASL Channel-Binding Type Capability.'><![CDATA[
|
|
<stream:features>
|
|
<mechanisms xmlns='urn:ietf:params:xml:ns:xmpp-sasl'>
|
|
<mechanism>EXTERNAL</mechanism>
|
|
<mechanism>SCRAM-SHA-1-PLUS</mechanism>
|
|
<mechanism>PLAIN</mechanism>
|
|
<sasl-channel-binding xmlns='urn:xmpp:sasl-cb:0'>
|
|
<channel-binding type='tls-server-end-point'/>
|
|
<channel-binding type='tls-exporter'/>
|
|
</sasl-channel-binding>
|
|
</mechanisms>
|
|
</stream:features>]]></example>
|
|
|
|
</section1>
|
|
|
|
<section1 topic='Security Considerations' anchor='security'>
|
|
|
|
<p>The author belives that this document itself does not yield any
|
|
new security considerations.<note>Hopefully somebody will correct him, in
|
|
case he is wrong.</note></p>
|
|
|
|
</section1>
|
|
|
|
<section1 topic='IANA Considerations' anchor='iana'>
|
|
|
|
<p>This document requires no interaction with &IANA;.</p>
|
|
|
|
</section1>
|
|
|
|
<section1 topic='XMPP Registrar Considerations' anchor='registrar'>
|
|
|
|
<p>This document requires no interaction with the XMPP registrar.</p>
|
|
|
|
</section1>
|
|
|
|
<section1 topic='XML Schema' anchor='schema'>
|
|
|
|
<p>TODO: Add if the XEP is scheduled for the state after 'experimental'.</p>
|
|
|
|
</section1>
|
|
|
|
<section1 topic='Acknowledgements' anchor='acknowledgements'>
|
|
|
|
<p>Thanks to Sam Whited for the discussion about the underlying
|
|
issue and incentivizing me to come up with this extension.</p>
|
|
|
|
</section1>
|
|
|
|
</xep>
|