One document matched: draft-petithuguenin-p2psip-access-control-02.xml
<?xml version="1.0" encoding="US-ASCII"?>
<?rfc compact="yes" ?>
<?rfc strict="no" ?>
<?rfc symrefs="yes" ?>
<?rfc toc="yes" ?>
<rfc category="std" docName="draft-petithuguenin-p2psip-access-control-02" ipr="noModificationTrust200902">
<front>
<title abbrev="Access Control Configuration">Configuration of Access Control Policy in REsource LOcation And Discovery (RELOAD) Base Protocol</title>
<author fullname="Marc Petit-Huguenin" initials="M.P.H" surname="Petit-Huguenin">
<organization>Stonyfish, Inc.</organization>
<address>
<email>petithug@acm.org</email>
</address>
</author>
<date day="13" month="May" year="2011"/>
<abstract>
<t>
This document describes an extension to the REsource LOcation And Discovery (RELOAD) base protocol to distribute the code of new Access Control Policies without having to upgrade the RELOAD implementations in an overlay.
</t>
</abstract>
</front>
<middle>
<section title="Introduction">
<t>
The RELOAD base protocol specifies an Access Control Policy as "defin[ing] whether a request from a given node to operate on a given value should succeed or fail."
The paragraph continues saying that "[i]t is anticipated that only a small number of generic access control policies are required", but there is indications that this assumption will not hold.
On all the RELOAD Usages defined in other documents than the RELOAD base protocol, roughly 50% defines a new Access Control Policy.
</t>
<t>
The problem with a new Access Control Policy is that, because it is executed when a Store request is processed, it needs to be implemented by all the peers and so requires an upgrade of the software.
This is something that is probably not possible in large overlays or on overlays using different implementations.
For this reason, this document proposes an extension to the RELOAD configuration document that permits to transport the code of a new Access Control Policy to each peer.
</t>
<t>
This extension defines a new element <access-control-code> that can be optionally added to a <kind> element in the configuration document.
The <access-control-code> element contains <xref target="ECMA-262">ECMAScript</xref> code that will be called for each StoredData object in a StoreReq processed by a peer.
The code receives four parameters, corresponding to the Resource-ID, Signature, Kind and StoredDataValue of the value to store.
The code returns true or false to signal to the implementation if the request should succeed or fail.
</t>
<t>For example the USER-MATCH Access Control Policy defined in the base protocol could be redefined by inserting the following code in an <access-control-code> element:</t>
<t>
<figure>
<artwork><![CDATA[return resource.equalsHash(signature.user_name.bytes());]]></artwork>
</figure>
</t>
<t>The <kind> parameters are also passed to the code, so the NODE-MULTIPLE Access Control Policy could be implemented like this:</t>
<t>
<figure>
<artwork><![CDATA[for (var i = 0; i < kind.max_node_multiple; i++) {
if (resource.equalsHash(signature.node_id, i.width(4))) {
return true;
}
}
return false;]]></artwork>
</figure>
</t>
</section>
<section title="Terminology">
<t>The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in <xref target="RFC2119"/>.</t>
</section>
<section title="Processing an extended Kind">
<t>A peer receiving a <kind> definition containing an access-control-code elemtn , either by retrieving it from the configuration server or in a ConfigUpdateReq message, MUST reject this configuration if the kind element is not signed or if the signature verification fails.</t>
<t>
If the <access-control-code> element is present in the namespace allocated to this specification, and the Access Control Policy is not natively implemented, then the code inside the element MUST be called for each DataValue found in a received StoreReq for this Kind.
For each call to the code, the following ECMAScript objects, properties and functions MUST be available:
</t>
<t>
<list style="hanging">
<t hangText="resource:">An opaque object representing the Resource-ID, as an array of bytes.</t>
<t hangText="resource.equalsHash(Object...):">
A function that returns true if hashing the concatenation of the arguments according to the mapping function of the overlay algorithm is equal to the Resource-ID.
Each argument is an array of bytes.
</t>
<t hangText="signature.user_name:">The rfc822Name stored in the certificate that was used to sign the request, as a String object.</t>
<t hangText="signature.node_id:">The Node-ID stored in the certificate that was used to sign the request, as an array of bytes.</t>
<t hangText="kind.id:">The id of the Kind associated with the entry, as a Number object.</t>
<t hangText="kind.name:">
If the Kind associated with the entry is registered by IANA, contains the name as a String object.
If not, this property is undefined.
</t>
<t hangText="kind.data_model:">The name of the Data Model associated with the entry, as a String object.</t>
<t hangText="kind.access_control:">The name of the Access Control Policy associated with the entry, as a String object.</t>
<t hangText="kind.max_count:">The value of the max-count element in the configuration file, as a Number object.</t>
<t hangText="kind.max_size:">The value of the max-size element in the configuration file as a Number object.</t>
<t hangText="kind.max_node_multiple:">
If the Access Control is MULTIPLE-NODE, contains the value of the max-node-multiple element in the configuration file, as a Number object.
If not, this property is undefined.
</t>
<t hangText="entry.index:">
If the Data Model is ARRAY, contains the index of the entry, as a Number object.
If not, this property is undefined.
</t>
<t hangText="entry.key:">
If the Data Model is DICTIONARY, contains the key of the entry, as an array of bytes.
If not, this property is undefined.
</t>
<t hangText="entry.storage_time:">The date and time used to store the entry, as a Date object.</t>
<t hangText="entry.lifetime:">The validity for the entry in seconds, as a Number object.</t>
<t hangText="entry.exists:">Indicates if the entry value exists, as Boolean object.</t>
<t hangText="entry.value:">This property contains an opaque object that represents the whole data, as an array of bytes.
</t>
</list>
</t>
<t>
The properties SHOULD NOT be modifiable or deletable and if they are, modifying or deleting them MUST NOT modify or delete the equivalent internal values (in other words, the code cannot be used to modify the elements that will be stored).
</t>
<t>
The value returned by the code is evaluated to true or false, according to the ECMAScript rules.
If the return value of one of the call to the code is evaluated to false, then the StoreReq fails, the state MUST be rolled back and an Error_Forbidden MUST be returned.
</t>
</section>
<section title="Security Considerations">
<t>TBD</t>
</section>
<section title="IANA Considerations">
<t>No IANA considerations.</t>
</section>
<section title="Acknowledgements">
<t>This document was written with the xml2rfc tool described in <xref target="RFC2629"/>.</t>
</section>
</middle>
<back>
<references title="Normative References">
<reference anchor="RFC2119">
<front>
<title abbrev="RFC Key Words">Key words for use in RFCs to Indicate Requirement Levels</title>
<author fullname="Scott Bradner" initials="S." surname="Bradner">
<organization>Harvard University</organization>
<address>
<postal>
<street>1350 Mass. Ave.</street>
<street>Cambridge</street>
<street>MA 02138</street>
</postal>
<phone>- +1 617 495 3864</phone>
<email>sob@harvard.edu</email>
</address>
</author>
<date month="March" year="1997"/>
<area>General</area>
<keyword>keyword</keyword>
<abstract>
<t>
In many standards track documents several words are used to signify
the requirements in the specification. These words are often
capitalized. This document defines these words as they should be
interpreted in IETF documents. Authors who follow these guidelines
should incorporate this phrase near the beginning of their document:
<list>
<t>
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL
NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in
RFC 2119.
</t>
</list>
</t>
<t>
Note that the force of these words is modified by the requirement
level of the document in which they are used.
</t>
</abstract>
</front>
<seriesInfo name="BCP" value="14"/>
<seriesInfo name="RFC" value="2119"/>
<format octets="4723" target="http://www.rfc-editor.org/rfc/rfc2119.txt" type="TXT"/>
<format octets="17491" target="http://xml.resource.org/public/rfc/html/rfc2119.html" type="HTML"/>
<format octets="5777" target="http://xml.resource.org/public/rfc/xml/rfc2119.xml" type="XML"/>
</reference>
<reference anchor="I-D.ietf-p2psip-base">
<front>
<title>REsource LOcation And Discovery (RELOAD) Base Protocol</title>
<author fullname="Cullen Jennings" initials="C" surname="Jennings">
<organization/>
</author>
<author fullname="Bruce Lowekamp" initials="B" surname="Lowekamp">
<organization/>
</author>
<author fullname="Eric Rescorla" initials="E" surname="Rescorla">
<organization/>
</author>
<author fullname="Salman Baset" initials="S" surname="Baset">
<organization/>
</author>
<author fullname="Henning Schulzrinne" initials="H" surname="Schulzrinne">
<organization/>
</author>
<date day="14" month="March" year="2011"/>
<abstract>
<t>This specification defines REsource LOcation And Discovery (RELOAD), a peer-to-peer (P2P) signaling protocol for use on the Internet. A P2P signaling protocol provides its clients with an abstract storage and messaging service between a set of cooperating peers that form the overlay network. RELOAD is designed to support a P2P Session Initiation Protocol (P2PSIP) network, but can be utilized by other applications with similar requirements by defining new usages that specify the kinds of data that must be stored for a particular application. RELOAD defines a security model based on a certificate enrollment service that provides unique identities. NAT traversal is a fundamental service of the protocol. RELOAD also allows access from "client" nodes that do not need to route traffic or store data for others. Legal THIS DOCUMENT AND THE INFORMATION CONTAINED THEREIN ARE PROVIDED ON AN "AS IS" BASIS AND THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY, THE IETF TRUST, AND THE INTERNET ENGINEERING TASK FORCE, DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION THEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.</t>
</abstract>
</front>
<seriesInfo name="Internet-Draft" value="draft-ietf-p2psip-base-13"/>
<format target="http://www.ietf.org/internet-drafts/draft-ietf-p2psip-base-13.txt" type="TXT"/>
</reference>
<reference anchor="ECMA-262">
<front>
<title>ECMAScript Language Specification 3rd Edition</title>
<author fullname="" initials="" surname="Ecma">
<organization/>
</author>
<date month="December" year="2009"/>
</front>
</reference>
</references>
<references title="Informative References">
<reference anchor="RFC2629">
<front>
<title>Writing I-Ds and RFCs using XML</title>
<author fullname="Marshall T. Rose" initials="M.T." surname="Rose">
<organization>Invisible Worlds, Inc.</organization>
<address>
<postal>
<street>660 York Street</street>
<city>San Francisco</city>
<region>CA</region>
<code>94110</code>
<country>US</country>
</postal>
<phone>+1 415 695 3975</phone>
<email>mrose@not.invisible.net</email>
<uri>http://invisible.net/</uri>
</address>
</author>
<date month="June" year="1999"/>
<area>General</area>
<keyword>RFC</keyword>
<keyword>Request for Comments</keyword>
<keyword>I-D</keyword>
<keyword>Internet-Draft</keyword>
<keyword>XML</keyword>
<keyword>Extensible Markup Language</keyword>
<abstract>
<t>This memo presents a technique for using XML
(Extensible Markup Language)
as a source format for documents in the Internet-Drafts (I-Ds) and
Request for Comments (RFC) series.</t>
</abstract>
</front>
<seriesInfo name="RFC" value="2629"/>
<format octets="48677" target="http://www.rfc-editor.org/rfc/rfc2629.txt" type="TXT"/>
<format octets="71741" target="http://xml.resource.org/public/rfc/html/rfc2629.html" type="HTML"/>
<format octets="53481" target="http://xml.resource.org/public/rfc/xml/rfc2629.xml" type="XML"/>
</reference>
<reference anchor="I-D.ietf-p2psip-service-discovery">
<front>
<title>Service Discovery Usage for REsource LOcation And Discovery (RELOAD)</title>
<author fullname="Jouni Maenpaa" initials="J" surname="Maenpaa">
<organization/>
</author>
<author fullname="Gonzalo Camarillo" initials="G" surname="Camarillo">
<organization/>
</author>
<date day="7" month="January" year="2011"/>
<abstract>
<t>REsource LOcation and Discovery (RELOAD) does not define a generic service discovery mechanism as part of the base protocol. This document defines how the Recursive Distributed Rendezvous (ReDiR) service discovery mechanism used in OpenDHT can be applied to RELOAD overlays to provide a generic service discovery mechanism.</t>
</abstract>
</front>
<seriesInfo name="Internet-Draft" value="draft-ietf-p2psip-service-discovery-02"/>
<format target="http://www.ietf.org/internet-drafts/draft-ietf-p2psip-service-discovery-02.txt" type="TXT"/>
</reference>
<reference anchor="I-D.knauf-p2psip-share">
<front>
<title>A Usage for Shared Resources in RELOAD (ShaRe)</title>
<author fullname="Alexander Knauf" initials="A" surname="Knauf">
<organization/>
</author>
<author fullname="Gabriel Hege" initials="G" surname="Hege">
<organization/>
</author>
<author fullname="Thomas Schmidt" initials="T" surname="Schmidt">
<organization/>
</author>
<author fullname="Matthias Waehlisch" initials="M" surname="Waehlisch">
<organization/>
</author>
<date day="7" month="March" year="2011"/>
<abstract>
<t>This document defines a RELOAD Usage for shared write access to RELOAD Resources. Shared Resources in RELOAD (ShaRe) form a basic primitive for enabling various coordination and notification schemes among distributed peers. Access in ShaRe is controlled by a hierarchical trust delegation scheme maintained within an access list. A new USER-CHAIN-ACL access policy allows authorized peers to write a Shared Resource without owning its corresponding certificate. This specification also adds mechanisms to store Resources with a variable name which is useful whenever peer-independent rendezvous processes are required.</t>
</abstract>
</front>
<seriesInfo name="Internet-Draft" value="draft-knauf-p2psip-share-00"/>
<format target="http://www.ietf.org/internet-drafts/draft-knauf-p2psip-share-00.txt" type="TXT"/>
</reference>
</references>
<section title="Examples">
<section title="Standard Access Control Policies">
<t>This section shows the ECMAScript code that could be used to implement the standard Access Control Policies defined in <xref target="I-D.ietf-p2psip-base"/>.</t>
<section title="USER-MATCH">
<t>
<figure>
<artwork><![CDATA[
String.prototype['bytes'] = function() {
var bytes = [];
for (var i = 0; i < this.length; i++) {
bytes[i] = this.charCodeAt(i);
}
return bytes;
};
return resource.equalsHash(signature.user_name.bytes());]]></artwork>
</figure>
</t>
</section>
<section title="NODE-MATCH">
<t>
<figure>
<artwork><![CDATA[
return resource.equalsHash(signature.node_id);]]></artwork>
</figure>
</t>
</section>
<section title="USER-NODE-MATCH">
<t>
<figure>
<artwork><![CDATA[
String.prototype['bytes'] = function() {
var bytes = [];
for (var i = 0; i < this.length; i++) {
bytes[i] = this.charCodeAt(i);
}
return bytes;
};
var equals = function(a, b) {
if (a.length !== b.length) return false;
for (var i = 0; i < a.length; i++) {
if (a[i] !== b[i]) return false;
}
return true;
};
return resource.equalsHash(signature.user_name.bytes())
&& equals(entry.key, signature.node_id);]]></artwork>
</figure>
</t>
</section>
<section title="NODE-MULTIPLE">
<t>
<figure>
<artwork><![CDATA[
Number.prototype['width'] = function(w) {
var bytes = [];
for (var i = 0; i < w; i++) {
bytes[i] = (this >>> ((w - i - 1) * 8)) & 255;
}
return bytes;
};
for (var i = 0; i < kind.max_node_multiple; i++) {
if (resource.equalsHash(signature.node_id, i.width(4))) {
return true;
}
}
return false;]]></artwork>
</figure>
</t>
<t>[[Note that base-13 do not state exactly the length of i when concatenated in the hash input]]</t>
</section>
</section>
<section title="Service Discovery Usage">
<t>
<xref target="I-D.ietf-p2psip-service-discovery"/> defines a specific Access Control Policy (NODE-ID-MATCH) that need to access the content of the entry to be written.
If implemented as specified by this document, the <kind> element would look something like this:
</t>
<t>
<figure>
<artwork><![CDATA[<kind name='REDIR'
xmlns:acp='http://implementers.org/access-control-policy'
xmlns:ext='http://implementers.org/my-ext'>
<data-model>DICTIONARY</data-model>
<access-control>NODE-ID-MATCH</access-control>
<max-count>100</max-count>
<max-size>60</max-size>
<acp:access-control-code>
/* Insert here the code from
http://jsfromhell.com/classes/bignumber
*/
var toBigNumber = function(node_id) {
var bignum = new BigNumber(0);
for (var i = 0; i < node_id.length; i++) {
bignum = bignum.multiply(256).add(node_id[i]);
}
return bignum;
};
var checkIntervals = function(node_id, level, node, factor) {
var size = new BigNumber(2).pow(128);
var node = toBigNumber(node_id);
for (var f = 0; f < factor; f++) {
var temp = size.multiply(new BigNumber(f)
.pow(new BigNumber(level).negate()));
var min = temp.multiply(node.add(new BigNumber(f)
.divide(factor)));
var max = temp.multiply(node.add(new BigNumber(f + 1)
.divide(factor)));
if (node.compare(min) === -1 || node.compare(max) == 1
|| node.compare(max) == 0) return false;
}
return true;
};
var equals = function(a, b) {
if (a.length !== b.length) return false;
for (var i = 0; i < a.length; i++) {
if (a[i] !== b[i]) return false;
}
return true;
};
var level = function(value) {
var length = value[16] * 256 + value[17];
return value[18 + length] * 256 + value[18 + length + 1];
};
var node = function(value) {
var length = value[16] * 256 + value[17];
return value[18 + length + 2] * 256
+ value[18 + length + 3];
};
var namespace = function(value) {
var length = value[16] * 256 + value[17];
return String.fromCharCode(value.slice(18, length));
};
var branching_factor = 2;
return equals(entry.key, signature.node_id)
&& (!entry.exists || checkIntervals(entry.key,
level(entry.value), node(entry.value),
branching_factor))
&& (!entry.exists
|| resource.equalsHash(namespace(entry.value),
level(entry.value), node(entry.value)));
</acp:access-control-code>
</kind>]]></artwork>
</figure>
</t>
<t>
Note that the code for the BigNumber object was removed from this example, as the licensing terms are unclear.
The code is available at <eref target="http://jsfromhell.com/classes/bignumber"/>.
</t>
<t>
The branching-factor variable in the code must match the <redirBranchingFactor> element, which is not accessible to the code.
The signer of the kind must be sure that the two match.
</t>
</section>
</section>
<section title="Release notes">
<t>This section must be removed before publication as an RFC.</t>
<section title="Modifications between -02 and -01">
<t>
<list style="symbols">
<t>Made clear that an unsigned kind with this extension must be rejected.</t>
<t>
Removed the kind.params array, and converted the max-count, max-size and max-node-multiple as Number objects.
Fixed the examples.
</t>
<t>
Removed the parsing of extensions in the kind element.
The former system did not work with namespaces or attributes, and the right solution (xpath) is probably too complex.
The value of the parameters can still be manually mirrored in the script, so there is perhaps no need for the added complexity.
Also fixed the examples.
</t>
<t>Reference draft-p2psip-share instance of draft-p2psip-disco.</t>
<t>Added a "Running Code Considerations" section that contain the reference to the reference implementation and script tester.</t>
<t>Nits</t>
</list>
</t>
</section>
<section title="Modifications between -01 and -00">
<t>
<list style="symbols">
<t>Changed reference from JavaScript to ECMAScript.</t>
<t>Changed signature from equals() to equalsHash().</t>
<t>Fixed the examples following implementation.</t>
<t>Replaced automatic decoding of value by ECMAScript code.</t>
<t>Added the type of each property.</t>
<t>Specified that the code cannot be used to modify the value stored.</t>
</list>
</t>
</section>
<section title="Running Code Considerations">
<t>
<list style="symbols">
<t>
Reference Implementation and Access Control Policy script tester (<http://debian.implementers.org/testing/source/reload.tar.gz>).
Marc Petit-Huguenin.
Implements version -02.
</t>
</list>
</t>
</section>
<section title="TODO List">
<t>
<list style="symbols">
<t>Need to convert <xref target="I-D.knauf-p2psip-share">ShaRe</xref> Usages USER-CHAIN-ACL and USER-PATTERN-MATCH.</t>
</list>
</t>
</section>
</section>
</back>
</rfc>
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