mirror of
https://github.com/moparisthebest/xeps
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Revert unpublished XEP 258 changes
This patch reverts changes to XEP 258 originally committed with:
c1173e8cf7a40a936e68a873069e191b846c7182
The previous two commits should be a no-op (I mistakenly hit
'push' instead of 'commit' when trying to construct this patch,
and then reverted that mistake.)
This commit is contained in:
Kurt Zeilenga
parent
560b05f8a9
commit
c3cd0f554b
599
xep-0258.xml
599
xep-0258.xml
@ -12,11 +12,11 @@
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]>
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]>
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<?xml-stylesheet type='text/xsl' href='xep.xsl'?>
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<?xml-stylesheet type='text/xsl' href='xep.xsl'?>
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<xep>
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<xep>
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<header>
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<header>
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<title>Security Labels in XMPP</title>
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<title>Security Labels in XMPP</title>
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<abstract>This document describes the use of security labels in XMPP. The document specifies
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<abstract>This document describes the use of security labels in XMPP. The document
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how security label metadata is carried in XMPP, when this metadata should or should not
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specifies how security label metadata is carried in XMPP, when this metadata
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be provided, and how the metadata is to be processed.</abstract>
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should or should not be provided, and how the metadata is to be processed.</abstract>
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&LEGALNOTICE;
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&LEGALNOTICE;
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<number>0258</number>
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<number>0258</number>
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<status>Experimental</status>
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<status>Experimental</status>
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@ -26,98 +26,79 @@
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<dependencies>
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<dependencies>
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<spec>XMPP Core</spec>
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<spec>XMPP Core</spec>
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<spec>XEP-0001</spec>
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<spec>XEP-0001</spec>
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<spec>XEP-0285</spec>
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</dependencies>
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</dependencies>
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<supersedes/>
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<supersedes/>
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<supersededby/>
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<supersededby/>
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<shortname>sec-label</shortname>
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<shortname>sec-label</shortname>
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&kdz;
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<author>
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<revision>
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<firstname>Kurt</firstname>
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<version>0.7</version>
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<surname>Zeilenga</surname>
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<date>2010-09-29</date>
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<email>Kurt.Zeilenga@Isode.COM</email>
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<initials>kdz</initials>
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<jid>Kurt.Zeilenga@Isode.COM</jid>
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<remark>
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</author>
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<p>Add initial support for secure binding of labels (digital signatures).</p>
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</remark>
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</revision>
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<revision>
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<revision>
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<version>0.6</version>
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<version>0.6</version>
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<date>2010-07-30</date>
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<date>2010-07-30</date>
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<initials>kdz</initials>
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<initials>kdz</initials>
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<remark>
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<remark><p>Extend catalog handling. Minor editorial changes.</p></remark>
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<p>Extend catalog handling. Minor editorial changes.</p>
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</remark>
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</revision>
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</revision>
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<revision>
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<revision>
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<version>0.5</version>
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<version>0.5</version>
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<date>2009-07-27</date>
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<date>2009-07-27</date>
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<initials>kdz</initials>
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<initials>kdz</initials>
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<remark>
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<remark><p>Remove &LABEL;/&EQUIVALENTLABEL; type= attribute. Clarify label catalog discovery. Clarify syntax of selector= attribute.</p></remark>
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<p>Remove &LABEL;/&EQUIVALENTLABEL; type= attribute. Clarify label catalog
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discovery. Clarify syntax of selector= attribute.</p>
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</remark>
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</revision>
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</revision>
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<revision>
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<revision>
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<version>0.4</version>
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<version>0.4</version>
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<date>2009-07-23</date>
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<date>2009-07-23</date>
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<initials>kdz</initials>
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<initials>kdz</initials>
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<remark>
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<remark><p>Update label catalogs to include user input selector.</p></remark>
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<p>Update label catalogs to include user input selector.</p>
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</remark>
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</revision>
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</revision>
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<revision>
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<revision>
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<version>0.3</version>
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<version>0.3</version>
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<date>2009-03-20</date>
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<date>2009-03-20</date>
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<initials>kdz</initials>
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<initials>kdz</initials>
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<remark>
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<remark><p>Add text regarding default bg/fg colors. Correct examples.</p></remark>
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<p>Add text regarding default bg/fg colors. Correct examples.</p>
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</remark>
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</revision>
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</revision>
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<revision>
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<revision>
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<version>0.2</version>
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<version>0.2</version>
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<date>2009-03-10</date>
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<date>2009-03-10</date>
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<initials>kdz</initials>
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<initials>kdz</initials>
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<remark>
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<remark><p>Reworked discovery and various updates.</p></remark>
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<p>Reworked discovery and various updates.</p>
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</remark>
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</revision>
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</revision>
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<revision>
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<revision>
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<version>0.1</version>
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<version>0.1</version>
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<date>2009-01-05</date>
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<date>2009-01-05</date>
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<initials>psa</initials>
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<initials>psa</initials>
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<remark>
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<remark><p>Initial published version.</p></remark>
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<p>Initial published version.</p>
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</remark>
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</revision>
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</revision>
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<revision>
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<revision>
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<version>0.0.081203</version>
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<version>0.0.081203</version>
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<date>2008-12-03</date>
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<date>2008-12-03</date>
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<initials>kdz</initials>
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<initials>kdz</initials>
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<remark>
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<remark><p>Initial draft.</p></remark>
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<p>Initial draft.</p>
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</remark>
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</revision>
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</revision>
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</header>
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</header>
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<section1 topic="Introduction" anchor="intro">
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<section1 topic='Introduction' anchor='intro'>
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<p>A security label, sometimes referred to as a confidentiality label, is a structured
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<p>A security label, sometimes referred to as a confidentiality label, is
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representation of the sensitivity of a piece of information. A security label is used in
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a structured representation of the sensitivity of a piece of information. A security
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conjunction with a clearance, a structured representation of what information
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label is used in conjunction with a clearance, a structured representation of what
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sensitivities a person (or other entity) is authorized to access, and a security policy
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information sensitivities a person (or other entity) is authorized to access, and a security
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to control access to each piece of information. For instance, message could be labeled
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policy to control access to each piece of information. For instance, message could be
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as "SECRET", and hence requiring the sender and the receiver to have a clearance
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labeled as "SECRET", and hence requiring the sender and the receiver to have a
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granting access to "SECRET" information. &X.841; provides a discussion of security
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clearance granting access to "SECRET" information. &X.841; provides a discussion of
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labels, clearances, and security policy.</p>
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security labels, clearances, and security policy.</p>
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<p>Sensitivity-based authorization is used in networks which operate under a set of
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<p>Sensitivity-based authorization is used in networks which operate under a set of
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information classification rules, such as in government military agency networks. The
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information classification rules, such as in government military agency networks. The
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standardized formats for security labels, clearances, and security policy are
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standardized formats for security labels, clearances, and security policy are
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generalized and do have application in non-government networks.</p>
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generalized and do have application in non-government networks.</p>
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<p>This document describes the use of security labels in &xmpp;. The document specifies how
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<p>This document describes the use of security labels in &xmpp;. The document specifies
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security label metadata is carried in XMPP. It standardizes a mechanism for carrying ESS
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how security label metadata is carried in XMPP. It standardizes a mechanism for
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Security Labels in XMPP, as well as provides for use of other label formats. ESS
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carrying ESS Security Labels in XMPP, as well as provides for use of other label
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Security Labels are specified in &rfc2634;. ESS Security Labels are commonly used in
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formats. ESS Security Labels are specified in &rfc2634;. ESS Security Labels are
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conjunction with &X.500; clearances and either X.841 or &SDN.801c; security
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commonly used in conjunction with &X.500; clearances and either X.841 or &SDN.801c;
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policies.</p>
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security policies.</p>
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<example caption="Message with ESS Security Label"><![CDATA[
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<example caption="Message with ESS Security Label"><![CDATA[
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<message to='romeo@example.net' from='juliet@example.com/balcony'>
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<message to='romeo@example.net' from='juliet@example.com/balcony'>
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<body>This content is classified.</body>
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<body>This content is classified.</body>
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@ -141,64 +122,34 @@
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]]></example>
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]]></example>
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<p>Note: The &IC-ISM; label example is for <em>illustrative purposes only</em>.</p>
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<p>Note: The &IC-ISM; label example is for <em>illustrative purposes only</em>.</p>
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<p>To securely bind the security label to the message, &xep0285; can be used as detailed below.</p>
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<p>The document details when security label metadata should or should not be provided, and how
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<example caption="Message with Securely bound ESS Security Label"><![CDATA[
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this metadata is to be processed.</p>
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<message to='romeo@example.net' from='juliet@example.com/balcony'>
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<signed xmlns="urn:xmpp:signed:0">
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<signature algorithm="RSA-SHA1">To-be-computed
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</signature>
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<data>
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PG1lc3NhZ2UgdG89J3JvbWVvQGV4YW1wbGUubmV0JyBmcm9tPSdqdWxpZXRAZXhhbXBsZS5jb20v
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YmFsY29ueSc+CiAgICA8Ym9keT5UaGlzIGNvbnRlbnQgaXMgY2xhc3NpZmllZC48L2JvZHk+CiAg
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ICA8c2VjdXJpdHlsYWJlbCB4bWxucz0ndXJuOnhtcHA6c2VjLWxhYmVsOjAnPgogICAgICAgIDxk
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aXNwbGF5bWFya2luZyBmZ2NvbG9yPSdibGFjaycgYmdjb2xvcj0ncmVkJz5TRUNSRVQ8L2Rpc3Bs
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YXltYXJraW5nPgogICAgICAgIDxsYWJlbD48aWNpc21sYWJlbCB4bWxucz0naHR0cDovL2V4YW1w
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bGUuZ292L0lDLUlTTS8wJyBjbGFzc2lmaWNhdGlvbj0nUycKICAgICAgICAgICAgb3duZXJQcm9k
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dWNlcj0nVVNBJy8+PC9sYWJlbD4KICAgIDwvc2VjdXJpdHlsYWJlbD4KPC9tZXNzYWdlPgo=
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</data>
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</message>
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]]>
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</example>
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<p>The document details when security label metadata should or should not be provided, and
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how this metadata is to be processed.</p>
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<p>This document does <em>not</em> provide:
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<p>This document does <em>not</em> provide:
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<ul>
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<ul>
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<li>any mechanism for a client might discover the security policy enforce at its
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<li>any mechanism for a client might discover the security policy
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home server, or any other server;</li>
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enforce at its home server, or any other server;</li>
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<li>any mechanism for a client to discover the user's clearance, or the clearance of
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<li>any mechanism for a client to discover the user's clearance,
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associated with any resource; nor</li>
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or the clearance of associated with any resource; nor</li>
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<li>any administrative mechanism for a client to configure configure policy,
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<li>any administrative mechanism for a client to configure
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clearance, and labels of any resource.</li>
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configure policy, clearance, and labels of any resource.</li>
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</ul>
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</ul>
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Such mechanisms may be introduced in subsequent documents.</p>
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</section1>
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<section1 topic="Discovering Feature Support" anchor="disco">
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Such mechanisms may be introduced in subsequent documents.</p>
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<p>If an entity supports the XMPP Security Label protocol, it MUST report that fact by
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</section1>
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including a service discovery feature of "<tt>urn:xmpp:sec-label:0</tt>" in response to
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a &xep0030; information request. Clients wishing to include a XMPP Security Label
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<section1 topic='Discovering Feature Support' anchor='disco'>
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element in any stanza they generate SHOULD determine if their server supports the XMPP
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<p>If an entity supports the XMPP Security Label protocol, it MUST report that fact
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Security Label protocol. If their server does not support XMPP Security Label, the
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by including a service discovery feature of "<tt>urn:xmpp:sec-label:0</tt>" in
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client SHOULD NOT generate XMPP Security Labels as the server not supporting this
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response to a &xep0030; information request. Clients wishing to include a XMPP
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protocol will generally ignore XMPP Security Labels as they would any other unrecognized
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Security Label element in any stanza they generate SHOULD determine if their
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element.</p>
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server supports the XMPP Security Label protocol. If their server does not
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<p>If an entity supports secure binding of the XMPP Security Label using &xmppdsig;, it MUST
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support XMPP Security Label, the client SHOULD NOT generate XMPP Security Labels
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report the fact by including a service discover feature of
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as the server not supporting this protocol will generally ignore XMPP Security
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"<tt>urn:xmpp:sec-label:dsig:0</tt>"" in response to a &xep0030; information request.
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Labels as they would any other unrecognized element.</p>
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Clients wishing to include a securely bound XMPP Security Label element in any stanza
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<p>As each service domain may have different support for security labels, servers
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they generate SHOULD determine if their server supports the XMPP Security Label
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should advertise and clients should perform appropriate discovery lookups on a
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protocol. If their server does not support securely bound XMPP Security Label, the
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per service basis.</p>
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client SHOULD NOT generate securely bound XMPP Security Labels as the server not
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supporting this protocol will generally ignore securely bound XMPP Security Labels as
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they would any other unrecognized element. Note that the client here is signing
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the stanzas for the benifit of its server. Its server will determine what content,
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if any, to forward to other entities. Hence, the sending client need determine whether
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any of the intended receipents supports XMPP Digital Signatures.</p>
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<p>As each service domain may have different support for security labels, servers should
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advertise and clients should perform appropriate discovery lookups on a per service
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basis.</p>
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<example caption="Service Discovery information request"><![CDATA[
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<example caption="Service Discovery information request"><![CDATA[
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<iq type='get'
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<iq type='get'
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from='user@example.com/Work'
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from='user@example.com/Work'
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@ -215,21 +166,20 @@
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<query xmlns='http://jabber.org/protocol/disco#info'>
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<query xmlns='http://jabber.org/protocol/disco#info'>
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...
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...
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<feature var='urn:xmpp:sec-label:0'/>
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<feature var='urn:xmpp:sec-label:0'/>
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<feature var='urn:xmpp:sec-label:dsig:0'/>
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...
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...
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</query>
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</query>
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</iq>
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</iq>
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]]></example>
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]]></example>
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<!--
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<!--
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<p>A server should only include &IDENTITY; elements in the response for services
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<p>A server should only include &IDENTITY; elements in the response for services
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the user is cleared to use.</p>
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the user is cleared to use.</p>
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-->
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-->
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</section1>
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</section1>
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<section1 topic="Protocol" anchor="protocol">
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<section1 topic='Protocol' anchor='protocol'>
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<p>An element, &SECURITYLABEL;, is defined to carry security label metadata. This metadata
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<p>An element, &SECURITYLABEL;, is defined to carry security label metadata. This metadata
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includes a security label, zero or more equivalent security labels, and optionally
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includes a security label, zero or more equivalent security labels, and optionally display
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display marking data.</p>
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marking data.</p>
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<example caption="Labeled Message"><![CDATA[
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<example caption="Labeled Message"><![CDATA[
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<message to='romeo@example.net' from='juliet@example.com/balcony'>
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<message to='romeo@example.net' from='juliet@example.com/balcony'>
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<body>This content is classified.</body>
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<body>This content is classified.</body>
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@ -246,69 +196,85 @@
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</securitylabel>
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</securitylabel>
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</message>
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</message>
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]]></example>
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]]></example>
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<p>The security label metadata is carried in an &SECURITYLABEL; element. The &SECURITYLABEL;
|
<p>The security label metadata is carried in an &SECURITYLABEL; element.
|
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element which contains one and only one &LABEL; element, zero or more &EQUIVALENTLABEL;
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The &SECURITYLABEL; element which contains one and only one &LABEL; element,
|
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elements, and an optional &DISPLAYMARKING; element.</p>
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zero or more &EQUIVALENTLABEL; elements, and an optional &DISPLAYMARKING; element.</p>
|
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<p>The &LABEL; provides the primary security label. It is commonly issued by the sender
|
<p>The &LABEL; provides the primary security label. It is commonly issued
|
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under the security policy of that they and their home server operating under. The
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by the sender under the security policy of that they and their home
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&LABEL; contains either a single element representing the primary security label or is
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server operating under. The &LABEL; contains either a single element
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empty to indicate use of a default.</p>
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representing the primary security label or is empty to indicate use of
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<p>Each &EQUIVALENTLABEL; represents an equivalent security label under other policies. Each
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a default.</p>
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&EQUIVALENTLABEL; contains a single element representing the equivalent label. This
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<p>Each &EQUIVALENTLABEL; represents an equivalent security label under
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element might be used when a recepient is known to hold a clearance under a different
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other policies. Each &EQUIVALENTLABEL; contains a single element
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policy than the sender.</p>
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representing the equivalent label. This element might be used when
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<p>The &DISPLAYMARKING; element contains a display string for use by implementations which
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a recepient is known to hold a clearance under a different policy
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are unable to utilize the applicable security policy to generate display markings. The
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than the sender.</p>
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element may optionally contain two attributes, <tt>fgcolor=</tt> and <tt>bgcolor=</tt>,
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<p>The &DISPLAYMARKING; element contains a display string for use by
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whose values are HTML color strings (e.g., '<tt>red</tt>' or '<tt>#ff0000</tt>'), for
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implementations which are unable to utilize the applicable security policy
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use in colorizing the display marking. The <tt>fgcolor=</tt> default is <tt>black</tt>.
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to generate display markings. The element may optionally contain two
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The <tt>bgcolor=</tt> default is <tt>white</tt>. </p>
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attributes, <tt>fgcolor=</tt> and <tt>bgcolor=</tt>, whose values are HTML
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</section1>
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color strings (e.g., '<tt>red</tt>' or '<tt>#ff0000</tt>'), for use in
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colorizing the display marking. The <tt>fgcolor=</tt> default is <tt>black</tt>.
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The <tt>bgcolor=</tt> default is <tt>white</tt>.
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</p>
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</section1>
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|
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<section1 topic="Label Catalog Discovery" anchor="label-catalog">
|
<section1 topic='Label Catalog Discovery' anchor='label-catalog'>
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<p>A client can request a catalog for a particular JID by sending a catalog discovery
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<p>A client can request a catalog for a particular JID by sending
|
||||||
request to the client's server. Where the JID is hosted by some other server, the
|
a catalog discovery request to the client's server. Where the JID
|
||||||
client's server is expected to produce a suitable catalog (or fail the request). The
|
is hosted by some other server, the client's server is expected to
|
||||||
client's server may, as needed, query catalogs from other servers in order to fulfill
|
produce a suitable catalog (or fail the request). The client's server
|
||||||
the client's request.</p>
|
may, as needed, query catalogs from other servers in order to
|
||||||
<p>While this specification does not preclude a client from directing a catalog request
|
fulfill the client's request.</p>
|
||||||
elsewhere, it is noted that catalog returned by a party other than its server may not be
|
<p>While this specification does not preclude a client from directing
|
||||||
directly useable by the client. For instance, the client's server might require a
|
a catalog request elsewhere, it is noted that catalog returned by
|
||||||
particular only-locally-known label be used in messages to a particular remote JID.</p>
|
a party other than its server may not be directly useable by the
|
||||||
<p>It is RECOMMENDED the server publish catalogs of security label for use by clients.</p>
|
client. For instance, the client's server might require a particular
|
||||||
<p>If catalog is restrictive, as indicated by the restrictive attribute with value of true,
|
only-locally-known label be used in messages to a particular remote
|
||||||
the client SHOULD use one of the labels (or no label) offered by the catalog.</p>
|
JID.</p>
|
||||||
<p>One and only one of the items may have a default attribute with value of true. The client
|
<p>It is RECOMMENDED the server publish catalogs of security label
|
||||||
should default to this item in cases where the user has not selected an item.</p>
|
for use by clients.</p>
|
||||||
<p>An item may have no label. Such an item offers a choice of sending a stanza without a
|
<p>If catalog is restrictive, as indicated by the restrictive attribute
|
||||||
label.</p>
|
with value of true, the client SHOULD use one of the labels
|
||||||
<p>Each catalog provided should only contain labels for which the client is allowed to use
|
(or no label) offered by the catalog.</p>
|
||||||
(based upon the user's authorization) in a particular context (such as in chatroom). A
|
<p>One and only one of the items may have a default attribute with
|
||||||
catalog may not be include the complete set of labels available for the use by the
|
value of true. The client should default to this item in cases
|
||||||
client in the context.</p>
|
where the user has not selected an item.</p>
|
||||||
<blockquote>Note: the single catalog per context approach used here is likely inadequate in
|
<p>An item may have no label. Such an item offers a choice of
|
||||||
enviroments where there are a large number of labels in use. It is expected that a more
|
sending a stanza without a label.</p>
|
||||||
sophisticated approach will be introduced in a subsequent revision of this
|
<p>Each catalog provided should only contain labels for which the client
|
||||||
|
is allowed to use (based upon the user's authorization) in a particular
|
||||||
|
context (such as in chatroom). A catalog may not be include the
|
||||||
|
complete set of labels available for the use by the client in the
|
||||||
|
context.</p>
|
||||||
|
<blockquote>Note: the single catalog per context approach used here
|
||||||
|
is likely inadequate in enviroments where there are a large number
|
||||||
|
of labels in use. It is expected that a more sophisticated approach
|
||||||
|
will be introduced in a subsequent revision of this
|
||||||
specification.</blockquote>
|
specification.</blockquote>
|
||||||
<p>As each service domain may have different support for security labels, servers should
|
<p>As each service domain may have different support for security labels,
|
||||||
advertise and clients should perform appropriate discovery lookups on a per service
|
servers should advertise and clients should perform appropriate
|
||||||
basis.</p>
|
discovery lookups on a per service basis.</p>
|
||||||
<p>To indicate the support for label catalog discovery, a server advertises the
|
<p>To indicate the support for label catalog discovery, a server
|
||||||
<tt>urn:xmpp:sec-label:catalog:2</tt> feature. The following pair of examples
|
advertises the <tt>urn:xmpp:sec-label:catalog:2</tt> feature.
|
||||||
illustrates this feature discovery.</p>
|
The following pair of examples illustrates this feature discovery.</p>
|
||||||
<p>Each item in the catalog may contain a selector attribute. The value of this attribute
|
<p>Each item in the catalog may contain a selector attribute. The
|
||||||
represents the item's placement in a hierarchical organization of the items. The value
|
value of this attribute represents the item's placement in a
|
||||||
of the selector attribute conforms to the selector-value ABNF production: <blockquote>
|
hierarchical organization of the items. The value of the selector
|
||||||
<![CDATA[
|
attribute conforms to the selector-value ABNF production:
|
||||||
|
<blockquote>
|
||||||
|
<![CDATA[
|
||||||
selector-value = (<item>"|")*<item>
|
selector-value = (<item>"|")*<item>
|
||||||
]]>
|
]]>
|
||||||
</blockquote>
|
</blockquote>
|
||||||
</p>
|
</p>
|
||||||
<p>where <item> is a sequence of characters not including "|".</p>
|
<p>where <item> is a sequence of characters not including "|".</p>
|
||||||
<p>A value of "X|Y|Z" indicates that this item is "Z" in the the "Y" subset of the "X"
|
<p>A value of "X|Y|Z" indicates that this item is "Z" in the
|
||||||
subset of items. This information may be used, for instance, in generating label
|
the "Y" subset of the "X" subset of items. This information may
|
||||||
selection menus in graphical user interfaces.</p>
|
be used, for instance, in generating label selection menus in
|
||||||
<blockquote>Note: use of unnecessarily deep hierarchies should be avoided.</blockquote>
|
graphical user interfaces.</p>
|
||||||
|
<blockquote>Note: use of unnecessarily deep hierarchies should be
|
||||||
|
avoided.</blockquote>
|
||||||
<example caption="Label Catalog Feature Discovery request"><![CDATA[
|
<example caption="Label Catalog Feature Discovery request"><![CDATA[
|
||||||
<iq type='get'
|
<iq type='get'
|
||||||
from='user@example.com/Work'
|
from='user@example.com/Work'
|
||||||
@ -329,9 +295,7 @@ selector-value = (<item>"|")*<item>
|
|||||||
</iq>
|
</iq>
|
||||||
]]></example>
|
]]></example>
|
||||||
|
|
||||||
<p>The following example pair illustrates catalog discovery. Note that client directs the
|
<p>The following example pair illustrates catalog discovery. Note that client directs the &IQ; to its server regardless of which catalog it requests (via the to= attribute of in &CATALOG; element).</p>
|
||||||
&IQ; to its server regardless of which catalog it requests (via the to= attribute of in
|
|
||||||
&CATALOG; element).</p>
|
|
||||||
|
|
||||||
<example caption="Label Catalog request"><![CDATA[
|
<example caption="Label Catalog request"><![CDATA[
|
||||||
<iq type='get' id='cat1'>
|
<iq type='get' id='cat1'>
|
||||||
@ -376,64 +340,72 @@ selector-value = (<item>"|")*<item>
|
|||||||
</catalog>
|
</catalog>
|
||||||
</iq>
|
</iq>
|
||||||
]]></example>
|
]]></example>
|
||||||
</section1>
|
</section1>
|
||||||
|
|
||||||
<section1 topic="Use in XMPP" anchor="xmpp-use">
|
<section1 topic='Use in XMPP' anchor='xmpp-use'>
|
||||||
<p>The sensitivity-based access control decisions discussed herein are to be made
|
<p>The sensitivity-based access control decisions discussed herein are to be
|
||||||
independently of other access control decisions or other facilities. That is, the
|
made independently of other access control decisions or other facilities.
|
||||||
sensitivity-based access control decisions are not conditional on other factors.</p>
|
That is, the sensitivity-based access control decisions are not conditional
|
||||||
<p>It is intended that &SECURITYLABEL; elements are only used as prescribed by this
|
on other factors.</p>
|
||||||
document, or other formal specifications. Any other use of &SECURITYLABEL; SHOULD be
|
<p>It is intended that &SECURITYLABEL; elements are only used as prescribed by
|
||||||
viewed as a protocol violation. The stanza SHOULD be discarded with, if approrpriate, an
|
this document, or other formal specifications. Any other use of
|
||||||
error response. Such error responses SHOULD NOT include content from the violating
|
&SECURITYLABEL; SHOULD be viewed as a protocol violation. The stanza SHOULD
|
||||||
stanza, excepting that necessary to well-formed error responses.</p>
|
be discarded with, if approrpriate, an error response. Such error responses
|
||||||
<p>When use of a &SECURITYLABEL; element is prescribed, that use is RECOMMENDED. Absence of
|
SHOULD NOT include content from the violating stanza, excepting that
|
||||||
a &SECURITYLABEL; element implies the stanza has the default label as specified in the
|
necessary to well-formed error responses.</p>
|
||||||
governing security policy. Given that the governing policy may not specify a default
|
<p>When use of a &SECURITYLABEL; element is prescribed, that use is RECOMMENDED.
|
||||||
label, hence denying access to the stanza, supporting clients SHOULD provide a
|
Absence of a &SECURITYLABEL; element implies the stanza has the default label
|
||||||
&SECURITYLABEL; element where prescribed.</p>
|
as specified in the governing security policy. Given that the governing
|
||||||
<p>Typically, a client would allow the user to choose populate the &SECURITYLABEL; from one
|
policy may not specify a default label, hence denying access to the stanza,
|
||||||
of from a small set of security labels selections known to it (through configuration
|
supporting clients SHOULD provide a &SECURITYLABEL; element where prescribed.</p>
|
||||||
and/or discovery and/or other means), such as from a pull-down menu. That selection
|
<p>Typically, a client would allow the user to choose populate the
|
||||||
would include appropriate values for the &LABEL;, &DISPLAYMARKING;, and
|
&SECURITYLABEL; from one of from a small set of security labels selections
|
||||||
&EQUIVALENTLABEL; elements.</p>
|
known to it (through configuration and/or discovery and/or other means),
|
||||||
<p>A policy-aware client may provide the user with an interface allowing the user to produce
|
such as from a pull-down menu. That selection would include appropriate
|
||||||
custom labeling data for inclusion in this set. A policy-aware client SHOULD preclude
|
values for the &LABEL;, &DISPLAYMARKING;, and &EQUIVALENTLABEL; elements.</p>
|
||||||
the user from producing &LABEL; values which the user's own clearance does not grant
|
<p>A policy-aware client may provide the user with an interface allowing the
|
||||||
access to, and SHOULD preclude sending any label which the user's own clearance does not
|
user to produce custom labeling data for inclusion in this set. A
|
||||||
grant access to. Each &EQUIVALENTLABEL; value, if any, MUST be equivalent under an
|
policy-aware client SHOULD preclude the user from producing &LABEL; values
|
||||||
equivalent policy to the &LABEL;. The &DISPLAYMARKING; element SHOULD be set the display
|
which the user's own clearance does not grant access to, and SHOULD preclude
|
||||||
marking prescribed for the &LABEL; under the governing policy, or, if the governing
|
sending any label which the user's own clearance does not grant access to.
|
||||||
policy prescribes no display marking for the &LABEL;, absent.</p>
|
Each &EQUIVALENTLABEL; value, if any, MUST be equivalent under an equivalent
|
||||||
<p>A client which receives a stanza with &SECURITYLABEL; element is to promiently display
|
policy to the &LABEL;. The &DISPLAYMARKING; element SHOULD be set the
|
||||||
the &DISPLAYMARKING; value. A policy-aware may alternatively promiently display the
|
display marking prescribed for the &LABEL; under the governing policy, or,
|
||||||
marking for the &LABEL; prescribed by the governing policy.</p>
|
if the governing policy prescribes no display marking for the &LABEL;,
|
||||||
<p>Each server is expected to make a number of sensitivity-based authorization decisions.
|
absent.</p>
|
||||||
Each decision is made by evaluating an Access Control Decision Function (ACDF) with a
|
<p>A client which receives a stanza with &SECURITYLABEL; element is to promiently
|
||||||
governing policy, a clearance, and a security label. The ACDF yields either
|
display the &DISPLAYMARKING; value. A policy-aware may alternatively
|
||||||
<em>Grant</em> or <em>Deny</em>.</p>
|
promiently display the marking for the &LABEL; prescribed by the governing
|
||||||
<p>If the user holds a valid clearance (known to the server) under the governing policy, the
|
policy.</p>
|
||||||
clearance input is the user's clearance. Otherwise, if the governing policy provides a
|
<p>Each server is expected to make a number of sensitivity-based authorization
|
||||||
default clearance, the clearance input is the default clearance. Otherwise, the
|
decisions. Each decision is made by evaluating an Access Control Decision
|
||||||
clearance input is the nil clearance. The nil clearance is a clearance for which the
|
Function (ACDF) with a governing policy, a clearance, and a security label.
|
||||||
ACDF always returns Deny when given as the clearance input.</p>
|
The ACDF yields either <em>Grant</em> or <em>Deny</em>.</p>
|
||||||
<p>If the stanza contains a &SECURITYLABEL; element and the either the &LABEL; element or
|
<p>If the user holds a valid clearance (known to the server) under the
|
||||||
one of the &EQUIVALENTLABEL; elements contain an appropriate label, that label input is
|
governing policy, the clearance input is the user's clearance. Otherwise,
|
||||||
that label. Otherwise, the label input is the default label provided the governing
|
if the governing policy provides a default clearance, the clearance input
|
||||||
policy or, if no default label is provided, the nil label. The nil label is a label for
|
is the default clearance. Otherwise, the clearance input is the nil clearance.
|
||||||
which the ACDF always returns Deny when given as the label input.</p>
|
The nil clearance is a clearance for which the ACDF always returns Deny when
|
||||||
<p>The term "effective clearance" and "effective label" refer, respectively, to the
|
given as the clearance input.</p>
|
||||||
clearance and label provided as input to the ACDF.</p>
|
<p>If the stanza contains a &SECURITYLABEL; element and the either the &LABEL;
|
||||||
<p>Not all sensitivity-based authorization decisions an XMPP server might make involve a
|
element or one of the &EQUIVALENTLABEL; elements contain an appropriate label,
|
||||||
user clearance and/or stanza label. A server may only provide service to users which
|
that label input is that label. Otherwise, the label input is the default
|
||||||
hold an appropriate clearance as determined by calling the ACDF with the user's
|
label provided the governing policy or, if no default label is provided,
|
||||||
clearance and a label associated with the service. A clearance might also be associated
|
the nil label. The nil label is a label for which the ACDF always returns
|
||||||
with the service to restrict the set of labels may be used in labeling stanzas. Labels
|
Deny when given as the label input.</p>
|
||||||
and clearances can also be associated with network interfaces, remote servers,
|
<p>The term "effective clearance" and "effective label" refer, respectively,
|
||||||
chatrooms, pubsub notes.</p>
|
to the clearance and label provided as input to the ACDF.</p>
|
||||||
<section2 topic="Use in Instant Messaging" anchor="im-use">
|
<p>Not all sensitivity-based authorization decisions an XMPP server might make
|
||||||
|
involve a user clearance and/or stanza label. A server may only provide
|
||||||
|
service to users which hold an appropriate clearance as determined by calling
|
||||||
|
the ACDF with the user's clearance and a label associated with the service.
|
||||||
|
A clearance might also be associated with the service to restrict the set
|
||||||
|
of labels may be used in labeling stanzas. Labels and clearances can also
|
||||||
|
be associated with network interfaces, remote servers, chatrooms, pubsub
|
||||||
|
notes.</p>
|
||||||
|
<section2 topic='Use in Instant Messaging' anchor='im-use'>
|
||||||
<p>A client may provide a &SECURITYLABEL; element in any &MESSAGE; it sends.</p>
|
<p>A client may provide a &SECURITYLABEL; element in any &MESSAGE; it sends.</p>
|
||||||
<!--
|
<!--
|
||||||
<p>The server will make, at a minimum, the following accessing control decisions:
|
<p>The server will make, at a minimum, the following accessing control decisions:
|
||||||
<ul>
|
<ul>
|
||||||
<li>TBD</li>
|
<li>TBD</li>
|
||||||
@ -441,48 +413,49 @@ selector-value = (<item>"|")*<item>
|
|||||||
</p>
|
</p>
|
||||||
-->
|
-->
|
||||||
</section2>
|
</section2>
|
||||||
<section2 topic="Use in Group Chat and Multi-User Chat" anchor="muc-use">
|
<section2 topic='Use in Group Chat and Multi-User Chat' anchor='muc-use'>
|
||||||
<p>A client may provide a &SECURITYLABEL; element in &MESSAGE; stanzas.</p>
|
<p>A client may provide a &SECURITYLABEL; element in &MESSAGE; stanzas.</p>
|
||||||
|
|
||||||
<section3 topic="Discovery" anchor="muc-disco">
|
<section3 topic='Discovery' anchor='muc-disco'>
|
||||||
<p>A server SHOULD provide a label feature and information discovery for the
|
<p>A server SHOULD provide a label feature and information discovery for the room.</p>
|
||||||
room.</p>
|
|
||||||
<p>Clients SHOULD discover label feature and information on a per room basis.</p>
|
<p>Clients SHOULD discover label feature and information on a per room basis.</p>
|
||||||
</section3>
|
</section3>
|
||||||
<section3 topic="Sending Messages" anchor="muc-send">
|
<section3 topic='Sending Messages' anchor='muc-send'>
|
||||||
<p>Sending groupchat messages is similiar to sending normal messages, however their
|
<p>Sending groupchat messages is similiar to sending normal messages, however
|
||||||
are a few differences.</p>
|
their are a few differences.</p>
|
||||||
<p>Groupchat messages are addressed to the room. The room clearance must be suitable
|
<p>Groupchat messages are addressed to the room. The room clearance must
|
||||||
for the message label, else it should be rejected.</p>
|
be suitable for the message label, else it should be rejected.</p>
|
||||||
<p>The room's clearance may allow a variety of labels to be used. Not all partipants
|
<p>The room's clearance may allow a variety of labels to be used. Not all
|
||||||
may be cleared for all labels allowed in the room. The server MUST only deliver
|
partipants may be cleared for all labels allowed in the room. The server
|
||||||
messages to partipants for which they are cleared to receive.</p>
|
MUST only deliver messages to partipants for which they are cleared to
|
||||||
|
receive.</p>
|
||||||
</section3>
|
</section3>
|
||||||
<section3 topic="Private Messages" anchor="muc-private">
|
<section3 topic='Private Messages' anchor='muc-private'>
|
||||||
<p>Private messages are treated as discussed in the "Use in Instant Messaging"
|
<p>Private messages are treated as discussed in the "Use in Instant Messaging"
|
||||||
section. (Should private messages be restricted by room's configuration?)</p>
|
section. (Should private messages be restricted by room's configuration?)</p>
|
||||||
</section3>
|
</section3>
|
||||||
<section3 topic="Invitations" anchor="muc-invite">
|
<section3 topic='Invitations' anchor='muc-invite'>
|
||||||
<p>Invitations may be labeled.</p>
|
<p>Invitations may be labeled.</p>
|
||||||
</section3>
|
</section3>
|
||||||
<section3 topic="Changing Subject" anchor="muc-subject">
|
<section3 topic='Changing Subject' anchor='muc-subject'>
|
||||||
<p>This section discusses semantics of &SECURITYLABEL; elements contained in
|
<p>This section discusses semantics of &SECURITYLABEL; elements contained
|
||||||
&MESSAGE; stanzas containing a &SUBJECT; element.</p>
|
in &MESSAGE; stanzas containing a &SUBJECT; element.</p>
|
||||||
<p>The presence of a &SECURITYLABEL; element indicates a request to change the
|
<p>The presence of a &SECURITYLABEL; element indicates a request to change
|
||||||
room's label, either to the provided label or, if the element is empty, to unset
|
the room's label, either to the provided label or, if the element is empty,
|
||||||
the room's label. The server is to refuse the request if the requestor is not
|
to unset the room's label. The server is to refuse the request if the
|
||||||
authorized to change the subject, not cleared for the requested label, or if the
|
requestor is not authorized to change the subject, not cleared for the
|
||||||
server is otherwise unwilling or unable to make the change. If the label change
|
requested label, or if the server is otherwise unwilling or unable to make
|
||||||
is refused, so must the accompanied subject change. Likewise, if the subject
|
the change. If the label change is refused, so must the accompanied
|
||||||
change is refused, so must the accompanied label change.</p>
|
subject change. Likewise, if the subject change is refused, so must the
|
||||||
<p>Upon change of the room's label, the server MUST immediately remove from the room
|
accompanied label change.</p>
|
||||||
all members whom are not cleared for that label.</p>
|
<p>Upon change of the room's label, the server MUST immediately remove from
|
||||||
<p>In absence of a &SECURITYLABEL; element, the label associated with the room is
|
the room all members whom are not cleared for that label.</p>
|
||||||
unchanged.</p>
|
<p>In absence of a &SECURITYLABEL; element, the label associated with the
|
||||||
<p>The room's label can also be changed through room configuration (to be discussed
|
room is unchanged.</p>
|
||||||
in later revision of this document).</p>
|
<p>The room's label can also be changed through room configuration (to be
|
||||||
|
discussed in later revision of this document).</p>
|
||||||
</section3>
|
</section3>
|
||||||
<!--
|
<!--
|
||||||
<section3 topic='Room Configuration' anchor='muc-config'>
|
<section3 topic='Room Configuration' anchor='muc-config'>
|
||||||
<p>The server may allow for configuration of security label parameters
|
<p>The server may allow for configuration of security label parameters
|
||||||
via room configuration mechanisms. The approach is intended to be
|
via room configuration mechanisms. The approach is intended to be
|
||||||
@ -556,20 +529,20 @@ selector-value = (<item>"|")*<item>
|
|||||||
</section3>
|
</section3>
|
||||||
-->
|
-->
|
||||||
</section2>
|
</section2>
|
||||||
<section2 topic="Use in Presence" anchor="presence-use">
|
<section2 topic='Use in Presence' anchor='presence-use'>
|
||||||
<p>&SECURITYLABEL; elements are not to appear in &PRESENCE; stanzas. Server SHALL treat
|
<p>&SECURITYLABEL; elements are not to appear in &PRESENCE; stanzas. Server
|
||||||
any &PRESENCE; stanza that contains a &SECURITYLABEL; as a protocol violation.</p>
|
SHALL treat any &PRESENCE; stanza that contains a &SECURITYLABEL; as a
|
||||||
<p>Presence information is subject to sensitivity-base authorization decisions, however
|
protocol violation.</p>
|
||||||
these decisions are made are made using a label associated with the presence
|
<p>Presence information is subject to sensitivity-base authorization decisions,
|
||||||
resource, such as a chatroom's label.</p>
|
however these decisions are made are made using a label associated with the
|
||||||
|
presence resource, such as a chatroom's label.</p>
|
||||||
</section2>
|
</section2>
|
||||||
<section2 topic="Use in PubSub" anchor="pubsub-use">
|
<section2 topic='Use in PubSub' anchor='pubsub-use'>
|
||||||
<section3 topic="Discovery" anchor="pubsub-disco">
|
<section3 topic='Discovery' anchor='pubsub-disco'>
|
||||||
<p>A server SHOULD provide a label feature and information discovery for each
|
<p>A server SHOULD provide a label feature and information discovery for each node.</p>
|
||||||
node.</p>
|
|
||||||
<p>Clients SHOULD discover label feature and information on a per node basis.</p>
|
<p>Clients SHOULD discover label feature and information on a per node basis.</p>
|
||||||
</section3>
|
</section3>
|
||||||
<section3 topic="Publishing items with Security Labels" anchor="muc-send">
|
<section3 topic='Publishing items with Security Labels' anchor='muc-send'>
|
||||||
<p>Each item may be individually labeled.</p>
|
<p>Each item may be individually labeled.</p>
|
||||||
<example caption="Publishing with a Security Label"><![CDATA[
|
<example caption="Publishing with a Security Label"><![CDATA[
|
||||||
<iq type='set'
|
<iq type='set'
|
||||||
@ -639,38 +612,41 @@ And by opposing end them?
|
|||||||
]]></example>
|
]]></example>
|
||||||
</section3>
|
</section3>
|
||||||
</section2>
|
</section2>
|
||||||
</section1>
|
</section1>
|
||||||
|
|
||||||
<section1 topic="Extension Considerations" anchor="exts">
|
<section1 topic='Extension Considerations' anchor='exts'>
|
||||||
<p> This extension is itself is extensible. In particular, the &LABEL; and &EQUIVALENTLABEL;
|
<p>
|
||||||
|
This extension is itself is extensible. In particular, the &LABEL; and &EQUIVALENTLABEL;
|
||||||
elements are designed to hold a range of security labels formats. XML namespaces SHOULD
|
elements are designed to hold a range of security labels formats. XML namespaces SHOULD
|
||||||
be used to avoid name clashes. </p>
|
be used to avoid name clashes.
|
||||||
</section1>
|
</p>
|
||||||
|
</section1>
|
||||||
|
|
||||||
<!--
|
<!--
|
||||||
<section1 topic='Implementation Notes' anchor='impl'>
|
<section1 topic='Implementation Notes' anchor='impl'>
|
||||||
<p>OPTIONAL.</p>
|
<p>OPTIONAL.</p>
|
||||||
</section1>
|
</section1>
|
||||||
-->
|
-->
|
||||||
<section1 topic="Security Considerations" anchor="security">
|
<section1 topic='Security Considerations' anchor='security'>
|
||||||
<p>This document is all about authorization, a key aspect of security. Hence, security
|
<p>This document is all about authorization, a key aspect of security. Hence,
|
||||||
considerations are discussed through this document.</p>
|
security considerations are discussed through this document.</p>
|
||||||
<p>Security labels generally should be securely bound to the object. This may be
|
<p>Security labels generally should be securely bound to the object. This may be
|
||||||
accomplished through use of &xmppdsig; as discussed in Appendix A.</p>
|
accomplished through use of &xmppe2e; signing, or possibly other signing
|
||||||
<p>Certain XMPP stanzas, such as &PRESENCE; stanzas, are not themselves subject to any
|
mechanisms.</p>
|
||||||
sensitity-based authorization decisions, and may be forwarded throughout the XMPP
|
<p>Certain XMPP stanzas, such as &PRESENCE; stanzas, are not themselves subject
|
||||||
network. The content of these stanzas should not contain information requiring
|
to any sensitity-based authorization decisions, and may be forwarded throughout
|
||||||
sensitivity-based dissemination controls.</p>
|
the XMPP network. The content of these stanzas should not contain information
|
||||||
</section1>
|
requiring sensitivity-based dissemination controls.</p>
|
||||||
<section1 topic="IANA Considerations" anchor="iana">
|
</section1>
|
||||||
|
<section1 topic='IANA Considerations' anchor='iana'>
|
||||||
<p>This document requires no interaction with &IANA;.</p>
|
<p>This document requires no interaction with &IANA;.</p>
|
||||||
</section1>
|
</section1>
|
||||||
<section1 topic="XMPP Registrar Considerations" anchor="registrar">
|
<section1 topic='XMPP Registrar Considerations' anchor='registrar'>
|
||||||
<p>It is requested the ®ISTRAR; add the extension's namespaces and schemas to appropriate
|
<p>It is requested the ®ISTRAR; add the extension's namespaces
|
||||||
XMPP registries.</p>
|
and schemas to appropriate XMPP registries.</p>
|
||||||
</section1>
|
</section1>
|
||||||
<section1 topic="XML Schemas" anchor="schema">
|
<section1 topic='XML Schemas' anchor='schema'>
|
||||||
<section2 topic="Extension Schema" anchor="schema-sl">
|
<section2 topic='Extension Schema' anchor='schema-sl'>
|
||||||
<p>
|
<p>
|
||||||
<code><![CDATA[
|
<code><![CDATA[
|
||||||
<?xml version='1.0' encoding='UTF-8'?>
|
<?xml version='1.0' encoding='UTF-8'?>
|
||||||
@ -769,11 +745,14 @@ And by opposing end them?
|
|||||||
</xs:complexType>
|
</xs:complexType>
|
||||||
</xs:element>
|
</xs:element>
|
||||||
</xs:schema>
|
</xs:schema>
|
||||||
]]></code> A copy of this schema is available at <link
|
]]></code>
|
||||||
url="http://www.xmpp.org/schemas/sec-label.xsd">
|
|
||||||
http://www.xmpp.org/schemas/sec-label.xsd</link>. </p>
|
A copy of this schema is available at
|
||||||
</section2>
|
<link url='http://www.xmpp.org/schemas/sec-label.xsd'>
|
||||||
<section2 topic="<catalog/> schema" anchor="schema-catalog">
|
http://www.xmpp.org/schemas/sec-label.xsd</link>.
|
||||||
|
</p>
|
||||||
|
</section2>
|
||||||
|
<section2 topic='<catalog/> schema' anchor='schema-catalog'>
|
||||||
<p>
|
<p>
|
||||||
<code><![CDATA[
|
<code><![CDATA[
|
||||||
<?xml version="1.0" encoding="UTF-8"?>
|
<?xml version="1.0" encoding="UTF-8"?>
|
||||||
@ -863,11 +842,14 @@ And by opposing end them?
|
|||||||
</xs:complexType>
|
</xs:complexType>
|
||||||
</xs:element>
|
</xs:element>
|
||||||
</xs:schema>
|
</xs:schema>
|
||||||
]]></code> A copy of this schema is available at <link
|
]]></code>
|
||||||
url="http://www.xmpp.org/schemas/sec-label-catalog.xsd">
|
|
||||||
http://www.xmpp.org/schemas/sec-label-catalog.xsd</link>. </p>
|
A copy of this schema is available at
|
||||||
</section2>
|
<link url='http://www.xmpp.org/schemas/sec-label-catalog.xsd'>
|
||||||
<section2 topic="<esssecuritylabel/> schema" anchor="schema-ess">
|
http://www.xmpp.org/schemas/sec-label-catalog.xsd</link>.
|
||||||
|
</p>
|
||||||
|
</section2>
|
||||||
|
<section2 topic='<esssecuritylabel/> schema' anchor='schema-ess'>
|
||||||
<p>
|
<p>
|
||||||
<code><![CDATA[
|
<code><![CDATA[
|
||||||
<?xml version="1.0" encoding="UTF-8"?>
|
<?xml version="1.0" encoding="UTF-8"?>
|
||||||
@ -885,9 +867,12 @@ And by opposing end them?
|
|||||||
</xs:annotation>
|
</xs:annotation>
|
||||||
</xs:element>
|
</xs:element>
|
||||||
</xs:schema>
|
</xs:schema>
|
||||||
]]></code> A copy of this schema is available at <link
|
]]></code>
|
||||||
url="http://www.xmpp.org/schemas/sec-label-ess.xsd">
|
|
||||||
http://www.xmpp.org/schemas/sec-label-ess.xsd</link>. </p>
|
A copy of this schema is available at
|
||||||
</section2>
|
<link url='http://www.xmpp.org/schemas/sec-label-ess.xsd'>
|
||||||
</section1>
|
http://www.xmpp.org/schemas/sec-label-ess.xsd</link>.
|
||||||
|
</p>
|
||||||
|
</section2>
|
||||||
|
</section1>
|
||||||
</xep>
|
</xep>
|
||||||
|
|||||||
Loading…
Reference in New Issue
Block a user