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<!DOCTYPE html>
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<head>
<meta name="description" content="This profile defines the actions, targets, specifiers and options that are consistent with the OpenC2 Language Specification in the context of stateless packet filtering.">
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<title>Open Command and Control (OpenC2) Profile for Stateless Packet Filtering Version 1.0</title>
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<p><img src="http://docs.oasis-open.org/templates/OASISLogo-v2.0.jpg" alt="OASIS Logo" /></p>
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<h1 id="open-command-and-control-openc2-profile-for-stateless-packet-filtering-version-10">Open Command and Control (OpenC2) Profile for Stateless Packet Filtering Version 1.0</h1>
<h2 id="committee-specification-draft-04--public-review-draft-01">Committee Specification Draft 04 /<br>Public Review Draft 01</h2>
<h2 id="17-october-2018">17 October 2018</h2>
<h3 id="specification-uris">Specification URIs</h3>
<h4 id="this-version">This version:</h4>
<ul type="none">
<li><a href="http://docs.oasis-open.org/openc2/oc2slpf/v1.0/csprd01/oc2slpf-v1.0-csprd01.md" class="uri">http://docs.oasis-open.org/openc2/oc2slpf/v1.0/csprd01/oc2slpf-v1.0-csprd01.md</a> (Authoritative)</li>
<li><a href="http://docs.oasis-open.org/openc2/oc2slpf/v1.0/csprd01/oc2slpf-v1.0-csprd01.html" class="uri">http://docs.oasis-open.org/openc2/oc2slpf/v1.0/csprd01/oc2slpf-v1.0-csprd01.html</a></li>
<li><a href="http://docs.oasis-open.org/openc2/oc2slpf/v1.0/csprd01/oc2slpf-v1.0-csprd01.pdf" class="uri">http://docs.oasis-open.org/openc2/oc2slpf/v1.0/csprd01/oc2slpf-v1.0-csprd01.pdf</a></li>
</ul>
<h4 id="previous-version">Previous version:</h4>
<ul type="none">
<li><a href="http://docs.oasis-open.org/openc2/oc2slpf/v1.0/csd03/oc2slpf-v1.0-csd03.md" class="uri">http://docs.oasis-open.org/openc2/oc2slpf/v1.0/csd03/oc2slpf-v1.0-csd03.md</a> (Authoritative)</li>
<li><a href="http://docs.oasis-open.org/openc2/oc2slpf/v1.0/csd03/oc2slpf-v1.0-csd03.html" class="uri">http://docs.oasis-open.org/openc2/oc2slpf/v1.0/csd03/oc2slpf-v1.0-csd03.html</a></li>
<li><a href="http://docs.oasis-open.org/openc2/oc2slpf/v1.0/csd03/oc2slpf-v1.0-csd03.pdf" class="uri">http://docs.oasis-open.org/openc2/oc2slpf/v1.0/csd03/oc2slpf-v1.0-csd03.pdf</a></li>
</ul>
<h4 id="latest-version">Latest version:</h4>
<ul type="none">
<li><a href="http://docs.oasis-open.org/openc2/oc2slpf/v1.0/oc2slpf-v1.0.md" class="uri">http://docs.oasis-open.org/openc2/oc2slpf/v1.0/oc2slpf-v1.0.md</a> (Authoritative)</li>
<li><a href="http://docs.oasis-open.org/openc2/oc2slpf/v1.0/oc2slpf-v1.0.html" class="uri">http://docs.oasis-open.org/openc2/oc2slpf/v1.0/oc2slpf-v1.0.html</a></li>
<li><a href="http://docs.oasis-open.org/openc2/oc2slpf/v1.0/oc2slpf-v1.0.pdf" class="uri">http://docs.oasis-open.org/openc2/oc2slpf/v1.0/oc2slpf-v1.0.pdf</a></li>
</ul>
<h4 id="technical-committee">Technical Committee:</h4>
<ul type="none">
<li><a href="https://www.oasis-open.org/committees/openc2/">OASIS Open Command and Control (OpenC2) TC</a></li>
</ul>
<h4 id="chairs">Chairs:</h4>
<ul type="none">
<li>Joe Brule (<a href="mailto:jmbrule@nsa.gov">jmbrule@nsa.gov</a>), <a href="https://www.nsa.gov/">National Security Agency</a></li>
<li>Sounil Yu (<a href="mailto:sounil.yu@bankofamerica.com">sounil.yu@bankofamerica.com</a>), <a href="http://www.bankofamerica.com/">Bank of America</a></li>
</ul>
<h4 id="editors">Editors:</h4>
<ul type="none">
<li>Joe Brule (<a href="mailto:jmbrule@nsa.gov">jmbrule@nsa.gov</a>), <a href="https://www.nsa.gov/">National Security Agency</a></li>
<li>Duncan Sparrell (<a href="mailto:duncan@sfractal.com">duncan@sfractal.com</a>), <a href="http://www.sfractal.com/">sFractal Consulting</a></li>
<li>Alex Everett (<a href="mailto:alex.everett@unc.edu">alex.everett@unc.edu</a>), <a href="http://www.unc.edu/">University of North Carolina, Chapel Hill</a></li>
</ul>
<h4 id="additional-artifacts">Additional artifacts:</h4>
<p>This prose specification is one component of a Work Product that also includes:</p>
<ul>
<li>SLPF schema (<a href="#annex-a-slpf-schema">Annex A</a>):
<ul>
<li><a href="http://docs.oasis-open.org/openc2/oc2slpf/v1.0/csprd01/schemas/oc2slpf-v1.0.json" class="uri">http://docs.oasis-open.org/openc2/oc2slpf/v1.0/csprd01/schemas/oc2slpf-v1.0.json</a> (authoritative)</li>
<li><a href="http://docs.oasis-open.org/openc2/oc2slpf/v1.0/csprd01/schemas/oc2slpf-v1.0.pdf" class="uri">http://docs.oasis-open.org/openc2/oc2slpf/v1.0/csprd01/schemas/oc2slpf-v1.0.pdf</a> (formatted)</li>
</ul></li>
<li>Tailored OpenC2 schema (<a href="#annex-b-tailored-openc2-schema">Annex B</a>):
<ul>
<li><a href="http://docs.oasis-open.org/openc2/oc2slpf/v1.0/csprd01/schemas/oc2ls-v1.0-slpf.json" class="uri">http://docs.oasis-open.org/openc2/oc2slpf/v1.0/csprd01/schemas/oc2ls-v1.0-slpf.json</a> (example)</li>
<li><a href="http://docs.oasis-open.org/openc2/oc2slpf/v1.0/csprd01/schemas/oc2ls-v1.0-slpf.pdf" class="uri">http://docs.oasis-open.org/openc2/oc2slpf/v1.0/csprd01/schemas/oc2ls-v1.0-slpf.pdf</a> (formatted)</li>
</ul></li>
<li>Merged schema example (<a href="#c45-actuator-schema">Annex C.4.5</a>):
<ul>
<li><a href="http://docs.oasis-open.org/openc2/oc2slpf/v1.0/csprd01/schemas/oc2ls-v1.0-slpf-merged.json" class="uri">http://docs.oasis-open.org/openc2/oc2slpf/v1.0/csprd01/schemas/oc2ls-v1.0-slpf-merged.json</a></li>
</ul></li>
</ul>
<h4 id="abstract">Abstract:</h4>
<p>Open Command and Control (OpenC2) is a concise and extensible language to enable the command and control of cyber defense components, subsystems and/or systems in a manner that is agnostic of the underlying products, technologies, transport mechanisms or other aspects of the implementation. Stateless packet filtering is a cyber defense mechanism that denies or allows traffic based on static properties of the traffic (such as address, port, protocol etc). This profile defines the actions, targets, specifiers and options that are consistent with version 1.0 of the OpenC2 Language Specification in the context of stateless packet filtering.</p>
<h4 id="status">Status:</h4>
<p>This document was last revised or approved by the OASIS Open Command and Control (OpenC2) TC on the above date. The level of approval is also listed above. Check the "Latest version" location noted above for possible later revisions of this document. Any other numbered Versions and other technical work produced by the Technical Committee (TC) are listed at <a href="https://www.oasis-open.org/committees/tc_home.php?wg_abbrev=openc2#technical" class="uri">https://www.oasis-open.org/committees/tc_home.php?wg_abbrev=openc2#technical</a>.</p>
<p>TC members should send comments on this specification to the TC's email list. Others should send comments to the TC's public comment list, after subscribing to it by following the instructions at the "Send A Comment" button on the TC's web page at <a href="https://www.oasis-open.org/committees/openc2/" class="uri">https://www.oasis-open.org/committees/openc2/</a>.</p>
<p>This specification is provided under the <a href="https://www.oasis-open.org/policies-guidelines/ipr#Non-Assertion-Mode">Non-Assertion</a> Mode of the OASIS IPR Policy, the mode chosen when the Technical Committee was established. For information on whether any patents have been disclosed that may be essential to implementing this specification, and any offers of patent licensing terms, please refer to the Intellectual Property Rights section of the TC's web page (<a href="https://www.oasis-open.org/committees/openc2/ipr.php" class="uri">https://www.oasis-open.org/committees/openc2/ipr.php</a>).</p>
<p>Note that any machine-readable content (<a href="https://www.oasis-open.org/policies-guidelines/tc-process#wpComponentsCompLang">Computer Language Definitions</a>) declared Normative for this Work Product is provided in separate plain text files. In the event of a discrepancy between any such plain text file and display content in the Work Product's prose narrative document(s), the content in the separate plain text file prevails.</p>
<h4 id="citation-format">Citation format:</h4>
<p>When referencing this specification the following citation format should be used:</p>
<p><strong>[OpenC2-SLPF-v1.0]</strong></p>
<p><em>Open Command and Control (OpenC2) Profile for Stateless Packet Filtering Version 1.0</em>. Edited by Joe Brule, Duncan Sparrell and Alex Everett. 17 October 2018. OASIS Committee Specification Draft 04 / Public Review Draft 01. <a href="http://docs.oasis-open.org/openc2/oc2slpf/v1.0/csprd01/oc2slpf-v1.0-csprd01.html" class="uri">http://docs.oasis-open.org/openc2/oc2slpf/v1.0/csprd01/oc2slpf-v1.0-csprd01.html</a>. Latest version: <a href="http://docs.oasis-open.org/openc2/oc2slpf/v1.0/oc2slpf-v1.0.html" class="uri">http://docs.oasis-open.org/openc2/oc2slpf/v1.0/oc2slpf-v1.0.html</a>.</p>
<hr />
<h2 id="notices">Notices</h2>
<p>Copyright © OASIS Open 2018. All Rights Reserved.</p>
<p>All capitalized terms in the following text have the meanings assigned to them in the OASIS Intellectual Property Rights Policy (the "OASIS IPR Policy"). The full <a href="https://www.oasis-open.org/policies-guidelines/ipr">Policy</a> may be found at the OASIS website.</p>
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<hr />
<h2 id="table-of-contents">Table of Contents</h2>
<nav id="TOC">
<ul type="none">
<li><a href="#1-introduction">1 Introduction</a><ul type="none">
<li><a href="#11-ipr-policy">1.1 IPR Policy</a></li>
<li><a href="#12-terminology">1.2 Terminology</a></li>
<li><a href="#13-normative-references">1.3 Normative References</a></li>
<li><a href="#14-non-normative-references">1.4 Non normative References</a></li>
<li><a href="#15-document-conventions">1.5 Document Conventions</a><ul type="none">
<li><a href="#151-naming-conventions">1.5.1 Naming Conventions</a></li>
<li><a href="#152-font-colors-and-style">1.5.2 Font Colors and Style</a></li>
</ul></li>
<li><a href="#16-overview">1.<strong>6</strong> Overview</a></li>
<li><a href="#17-goal">1.7 Goal</a></li>
<li><a href="#18-purpose-and-scope">1.8 Purpose and Scope</a></li>
</ul></li>
<li><a href="#2-openc2-language-binding">2 OpenC2 Language Binding</a><ul type="none">
<li><a href="#21-openc2-command-components">2.1 OpenC2 Command Components</a><ul type="none">
<li><a href="#211-actions">2.1.1 Actions</a></li>
<li><a href="#212-targets">2.1.2 Targets</a><ul type="none">
<li><a href="#2121-common-targets">2.1.2.1 Common Targets</a></li>
<li><a href="#2122-slpf-targets">2.1.2.2 SLPF Targets</a></li>
</ul></li>
<li><a href="#213-command-arguments">2.1.3 Command Arguments</a><ul type="none">
<li><a href="#2131-common-args">2.1.3.1 Common Args</a></li>
<li><a href="#2132-slpf-args">2.1.3.2 SLPF Args</a></li>
</ul></li>
<li><a href="#214-actuator-specifiers">2.1.4 Actuator Specifiers</a></li>
</ul></li>
<li><a href="#22-openc2-response-components">2.2 OpenC2 Response Components</a><ul type="none">
<li><a href="#221-common-results">2.2.1 Common Results</a></li>
<li><a href="#222-slpf-results">2.2.2 SLPF Results</a></li>
</ul></li>
<li><a href="#23-openc2-commands">2.3 OpenC2 Commands</a><ul type="none">
<li><a href="#231-allow">2.3.1 ‘Allow’</a><ul type="none">
<li><a href="#2311-allow-ip_connection">2.3.1.1 ‘Allow ip_connection’</a></li>
<li><a href="#2312-allow-ip_addr">2.3.1.2 ‘Allow ip_addr’</a></li>
</ul></li>
<li><a href="#232-deny">2.3.2 ‘Deny’</a></li>
<li><a href="#233-query">2.3.3 ‘Query’</a><ul type="none">
<li><a href="#2331-query-features">2.3.3.1 ‘Query features’</a></li>
</ul></li>
<li><a href="#234-delete">2.3.4 ‘Delete’</a><ul type="none">
<li><a href="#2341-delete-slpfrule_number">2.3.4.1 ‘delete slpf:rule_number’</a></li>
</ul></li>
<li><a href="#235-update">2.3.5 Update</a><ul type="none">
<li><a href="#2351-update-file">2.3.5.1 Update file</a></li>
</ul></li>
</ul></li>
</ul></li>
<li><a href="#3-conformance-statements">3 Conformance statements</a><ul type="none">
<li><a href="#31-conformance-clause-1-basic-slpf-producers">3.1 Conformance Clause 1: Basic SLPF Producers</a></li>
<li><a href="#32-conformance-clause-2-basic-slpf-consumers">3.2 Conformance Clause 2: Basic SLPF Consumers</a></li>
<li><a href="#33-conformance-clause-3-complete-slpf-producers">3.3 Conformance Clause 3: Complete SLPF Producers</a></li>
<li><a href="#34-conformance-clause-4-complete-slpf-consumers">3.4 Conformance Clause 4: Complete SLPF Consumers</a></li>
</ul></li>
<li><a href="#annex-a-slpf-schema">Annex A SLPF Schema</a></li>
<li><a href="#annex-b-tailored-openc2-schema">Annex B Tailored OpenC2 Schema</a></li>
<li><a href="#annex-c-sample-commands-informative">Annex C Sample commands (Informative)</a><ul type="none">
<li><a href="#c1-deny-and-allow">C.1 Deny and Allow</a><ul type="none">
<li><a href="#c11-deny-a-particular-connection">C.1.1 Deny a particular connection</a></li>
<li><a href="#c12-block-all-outbound-ftp-transfers">C.1.2 Block all outbound ftp transfers</a></li>
<li><a href="#c13-block-all-inbound-traffic-from-a-particular-source">C.1.3 Block all inbound traffic from a particular source.</a></li>
<li><a href="#c14-permit-ftp-transfers-to-a-particular-destination">C.1.4 Permit ftp transfers to a particular destination.</a></li>
</ul></li>
<li><a href="#c2-delete-rule">C.2 Delete Rule</a></li>
<li><a href="#c3-update-file">C.3 Update file</a></li>
<li><a href="#c4-query-openc2">C.4 Query openc2</a><ul type="none">
<li><a href="#c41-no-query-items-set">C.4.1 No query items set</a></li>
<li><a href="#c42-version-of-language-specification-supported">C.4.2 Version of Language specification supported</a></li>
<li><a href="#c43-actuator-profiles-supported">C.4.3 Actuator profiles supported</a></li>
<li><a href="#c44-specific-commands-supported">C.4.4 Specific Commands Supported</a></li>
<li><a href="#c45-actuator-schema">C.4.5 Actuator Schema</a></li>
</ul></li>
</ul></li>
<li><a href="#annex-d-acknowledgments">Annex D Acknowledgments</a></li>
<li><a href="#annex-e-revision-history">Annex E Revision History</a></li>
</ul>
</nav>
<hr />
<h1 id="1-introduction">1 Introduction</h1>
<p>OpenC2 is a suite of specifications that enables command and control of cyber defense systems and components. OpenC2 typically uses a request-response paradigm where a command is encoded by an OpenC2 producer (managing application) and transferred to an OpenC2 consumer (managed device or virtualized function) using a secure transport protocol, and the consumer can respond with status and any requested information. The contents of both the command and the response are fully described in schemas, allowing both parties to recognize the syntax constraints imposed on the exchange.</p>
<p>OpenC2 allows the application producing the commands to discover the set of capabilities supported by the managed devices. These capabilities permit the managing application to adjust its behavior to take advantage of the features exposed by the managed device. The capability definitions can be easily extended in a noncentralized manner, allowing standard and non-standard capabilities to be defined with semantic and syntactic rigor.</p>
<h2 id="11-ipr-policy">1.1 IPR Policy</h2>
<p>This specification is provided under the <a href="https://www.oasis-open.org/policies-guidelines/ipr#Non-Assertion-Mode">Non-Assertion</a> Mode of the OASIS IPR Policy, the mode chosen when the Technical Committee was established. For information on whether any patents have been disclosed that may be essential to implementing this specification, and any offers of patent licensing terms, please refer to the Intellectual Property Rights section of the TC's web page (<a href="https://www.oasis-open.org/committees/openc2/ipr.php" class="uri">https://www.oasis-open.org/committees/openc2/ipr.php</a>).</p>
<h2 id="12-terminology">1.2 Terminology</h2>
<ul>
<li><strong>Action</strong>: The task or activity to be performed.</li>
<li><strong>Actuator</strong>: The entity that performs the action.</li>
<li><strong>Command</strong>: A message defined by an action-target pair that is sent from a producer and received by a consumer.</li>
<li><strong>Consumer</strong>: A managed device / application that receives Commands. Note that a single device / application can have both consumer and producer capabilities.</li>
<li><strong>Producer</strong>: A manager application that sends Commands.</li>
<li><strong>Response</strong>: A message from a consumer to a producer acknowledging a command or returning the requested resources or status to a previously received request.</li>
<li><strong>Target</strong>: The object of the action, i.e., the action is performed on the target.</li>
</ul>
<p>The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [<a href="#rfc2119">BCP 14, RFC2119</a>] [<a href="#rfc8174">RFC8174</a>] when, and only when, they appear in all capitals, as shown here.</p>
<h2 id="13-normative-references">1.3 Normative References</h2>
<h6 id="rfc2119">[RFC2119]</h6>
<p>Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, <a href="http://www.rfc-editor.org/info/rfc2119" class="uri">http://www.rfc-editor.org/info/rfc2119</a>.</p>
<h6 id="rfc8174">[RFC8174]</h6>
<p>Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, <a href="http://www.rfc-editor.org/info/rfc8174" class="uri">http://www.rfc-editor.org/info/rfc8174</a>.</p>
<h6 id="rfc8259">[RFC8259]</h6>
<p>Bray, T., "The JavaScript Object Notation (JSON) Data Interchange Format", December 2017, <a href="https://tools.ietf.org/html/rfc8259" class="uri">https://tools.ietf.org/html/rfc8259</a>.</p>
<h6 id="rfc1123">[RFC1123]</h6>
<p>Author, T., "Requirements for Internet Hosts", October 1989. <a href="https://tools.ietf.org/html/rfc1123" class="uri">https://tools.ietf.org/html/rfc1123</a>.</p>
<h6 id="rfc4291">[RFC4291]</h6>
<p>Hinden, R., Deering S. , T., "IP Version 6 Addressing Architecture ", February 2006, <a href="https://tools.ietf.org/html/rfc4291" class="uri">https://tools.ietf.org/html/rfc4291</a>.</p>
<h6 id="rfc2673">[RFC2673]</h6>
<p>Crawford, M., "Binary Labels in Domain Name System", August 1999, <a href="https://tools.ietf.org/html/rfc2673" class="uri">https://tools.ietf.org/html/rfc2673</a>.</p>
<h6 id="rfc3339">[RFC3339]</h6>
<p>Kline, G., "Date and Time on the Internet: Timestamps", July 2002, <a href="https://tools.ietf.org/html/rfc3339" class="uri">https://tools.ietf.org/html/rfc3339</a>.</p>
<h6 id="rfc5237">[RFC5237]</h6>
<p>Arkko, J., Erricsson, S. , "IANA Allocation Guidelines for the Protocol Field", February 2008, <a href="https://tools.ietf.org/html/rfc5237" class="uri">https://tools.ietf.org/html/rfc5237</a>.</p>
<h6 id="openc2-lang-v10">[OpenC2-Lang-v1.0]</h6>
<p><em>Open Command and Control (OpenC2) Language Specification Version 1.0</em>. Edited by Jason Romano and Duncan Sparrell. Latest version: <a href="http://docs.oasis-open.org/openc2/oc2ls/v1.0/oc2ls-v1.0.html" class="uri">http://docs.oasis-open.org/openc2/oc2ls/v1.0/oc2ls-v1.0.html</a>.</p>
<h2 id="14-non-normative-references">1.4 Non normative References</h2>
<h6 id="openc2-https-v10">[OpenC2-HTTPS-v1.0]</h6>
<p><em>Specification for Transfer of OpenC2 Messages via HTTPS Version 1.0</em>. Edited by David Lemire. Latest version: <a href="http://docs.oasis-open.org/openc2/open-impl-https/v1.0/open-impl-https-v1.0.html" class="uri">http://docs.oasis-open.org/openc2/open-impl-https/v1.0/open-impl-https-v1.0.html</a>.</p>
<h2 id="15-document-conventions">1.5 Document Conventions</h2>
<h3 id="151-naming-conventions">1.5.1 Naming Conventions</h3>
<ul>
<li>RFC2119/RFC8174 key words (see section 1.2) are in all uppercase.</li>
<li>All property names and literals are in lowercase, except when referencing canonical names defined in another standard (e.g., literal values from an IANA registry).</li>
<li>All words in structure component names are capitalized and are separated with a hyphen, e.g., ACTION, TARGET, TARGET-SPECIFIER.</li>
<li>Words in property names are separated with an underscore (_), while words in string enumerations and type names are separated with a hyphen (-).</li>
<li>The term "hyphen" used here refers to the ASCII hyphen or minus character, which in Unicode is "hyphen-minus", U+002D.</li>
<li>All type names, property names, object names, and vocabulary terms are between three and 40 characters long.</li>
</ul>
<h3 id="152-font-colors-and-style">1.5.2 Font Colors and Style</h3>
<p>The following color, font and font style conventions are used in this document:</p>
<ul>
<li>A fixed width font is used for all type names, property names, and literals.</li>
<li>Property names are in bold style – **<code>created_a**t</code></li>
<li>All examples in this document are expressed in JSON. They are in fixed width font, with straight quotes, black text and a light shaded background, and 4-space indentation. JSON examples in this document are representations of JSON Objects. They should not be interpreted as string literals. The ordering of object keys is insignificant. Whitespace before or after JSON structural characters in the examples are insignificant [<a href="#rfc8259">RFC8259</a>].</li>
<li>Parts of the example may be omitted for conciseness and clarity. These omitted parts are denoted with the ellipses (...).</li>
</ul>
<p>Example:</p>
<div class="sourceCode" id="cb1"><pre class="sourceCode javascript"><code class="sourceCode javascript"><a class="sourceLine" id="cb1-1" data-line-number="1"><span class="op">{</span> </a>
<a class="sourceLine" id="cb1-2" data-line-number="2"> <span class="st">"action"</span><span class="op">:</span> <span class="st">"contain"</span><span class="op">,</span></a>
<a class="sourceLine" id="cb1-3" data-line-number="3"> <span class="st">"target"</span><span class="op">:</span> <span class="op">{</span></a>
<a class="sourceLine" id="cb1-4" data-line-number="4"> <span class="st">"user_account"</span><span class="op">:</span> <span class="op">{</span></a>
<a class="sourceLine" id="cb1-5" data-line-number="5"> <span class="st">"user_id"</span><span class="op">:</span> <span class="st">"fjbloggs"</span><span class="op">,</span></a>
<a class="sourceLine" id="cb1-6" data-line-number="6"> <span class="st">"account_type"</span><span class="op">:</span> <span class="st">"windows-local"</span></a>
<a class="sourceLine" id="cb1-7" data-line-number="7"> <span class="op">}</span></a>
<a class="sourceLine" id="cb1-8" data-line-number="8"> <span class="op">}</span></a>
<a class="sourceLine" id="cb1-9" data-line-number="9"><span class="op">}</span></a></code></pre></div>
<h2 id="16-overview">1.<strong>6</strong> Overview</h2>
<p>OpenC2 is a suite of specifications to command actuators that execute cyber defense functions. These specifications include the OpenC2 Language Specification, Actuator Profiles, and Transfer Specifications. The OpenC2 Language Specification and Actuator Profile(s) specifications focus on the standard at the producer and consumer of the command and response while the transfer specifications focus on the protocols for their exchange.</p>
<ul>
<li>The OpenC2 Language Specification provides the semantics for the essential elements of the language, the structure for commands and responses, and the schema that defines the proper syntax for the language elements that represents the command or response.</li>
<li>OpenC2 Actuator Profiles specify the subset of the OpenC2 language relevant in the context of specific actuator functions. Cyber defense components, devices, systems and/or instances may (in fact are likely) to implement multiple actuator profiles. Actuator profiles extend the language by defining specifiers that identify the actuator to the required level of precision and may define command arguments that are relevant and/or unique to those actuator functions.</li>
<li>OpenC2 Transfer Specifications utilize existing protocols and standards to implement OpenC2 in specific environments. These standards are used for communications and security functions beyond the scope of the language, such as message transfer encoding, authentication, and end-to-end transport of OpenC2 messages.</li>
</ul>
<p>The OpenC2 Language Specification defines a language used to compose messages for command and control of cyber defense systems and components. A message consists of a header and a payload (<em>defined</em> as a message body in the OpenC2 Language Specification Version 1.0 and <em>specified</em> in one or more actuator profiles).</p>
<p>In general, there are two types of participants involved in the exchange of OpenC2 messages, as depicted in Figure 1-1:</p>
<ol>
<li><strong>OpenC2 Producers</strong>: An OpenC2 Producer is an entity that creates commands to provide instruction to one or more systems to act in accordance with the content of the command. An OpenC2 Producer may receive and process responses in conjunction with a command.</li>
<li><strong>OpenC2 Consumers</strong>: An OpenC2 Consumer is an entity that receives and may act upon an OpenC2 command. An OpenC2 Consumer may create responses that provide any information captured or necessary to send back to the OpenC2 Producer.</li>
</ol>
<p>The language defines two payload structures:</p>
<ol>
<li><strong>Command</strong>: An instruction from one system known as the OpenC2 "Producer", to one or more systems, the OpenC2 "Consumer(s)", to act on the content of the command.</li>
<li><strong>Response</strong>: Any information captured or necessary to send back to the OpenC2 Producer that issued the Command, i.e., the OpenC2 Consumer’s response to the OpenC2 Producer.</li>
</ol>
<p><img src="./images/image_1.png" alt="no alt title" /></p>
<p><strong>Figure 1-1. OpenC2 Message Exchange</strong></p>
<p>OpenC2 implementations integrate the related OpenC2 specifications described above with related industry specifications, protocols, and standards. Figure 1 depicts the relationships among OpenC2 specifications, and their relationships to other industry standards and environment-specific implementations of OpenC2. Note that the layering of implementation aspects in the diagram is notional, and not intended to preclude, e.g., the use of an application-layer message signature function to provide message source authentication and integrity.</p>
<p><img src="./images/image_2.png" alt="no alt title" /></p>
<p><strong>Figure 1-2. OpenC2 Documentation and Layering Model</strong></p>
<p>OpenC2 is conceptually partitioned into four layers as shown in Table 1-1.</p>
<p><strong>Table 1-1. OpenC2 Protocol Layers</strong></p>
<table>
<thead>
<tr class="header">
<th style="text-align: left;">Layer</th>
<th style="text-align: left;">Examples</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td style="text-align: left;">Function-Specific Content</td>
<td style="text-align: left;">Actuator Profiles<br>(standard and extensions)</td>
</tr>
<tr class="even">
<td style="text-align: left;">Common Content</td>
<td style="text-align: left;">Language Specification<br>(this document)</td>
</tr>
<tr class="odd">
<td style="text-align: left;">Message</td>
<td style="text-align: left;">Transfer Specifications<br>(OpenC2-over-HTTPS, OpenC2-over-CoAP, …)</td>
</tr>
<tr class="even">
<td style="text-align: left;">Secure Transport</td>
<td style="text-align: left;">HTTPS, CoAP, MQTT, OpenDXL, ...</td>
</tr>
</tbody>
</table>
<ul>
<li>The <strong>Secure Transport</strong> layer provides a communication path between the producer and the consumer. OpenC2 can be layered over any standard transport protocol.</li>
<li>The <strong>Message</strong> layer provides a transport- and content-independent mechanism for conveying requests, responses, and notifications. A transfer specification maps transport-specific protocol elements to a transport-independent set of message elements consisting of content and associated metadata.</li>
<li>The <strong>Common Content</strong> layer defines the structure of OpenC2 commands and responses and a set of common language elements used to construct them.</li>
<li>The <strong>Function-specific Content</strong> layer defines the language elements used to support a particular cyber defense function. An actuator profile defines the implementation conformance requirements for that function. OpenC2 Producers and Consumers will support one or more profiles.</li>
</ul>
<p>The components of an OpenC2 Command are an action (what is to be done), a target (what is being acted upon), an optional actuator (what is performing the command), and command arguments, which influence how the command is to be performed. An action coupled with a target is sufficient to describe a complete OpenC2 Command. Though optional, the inclusion of an actuator and/or command arguments provides additional precision to a command, when needed.</p>
<p>The components of an OpenC2 Response are a numerical status code, an optional status text string, and optional results. The format of the results, if included, depend on the type or response being transferred.</p>
<h2 id="17-goal">1.7 Goal</h2>
<p>The goal of the OpenC2 Language Specification is to provide a language for interoperating between functional elements of cyber defense systems. This language used in conjunction with OpenC2 Actuator Profiles and OpenC2 Transfer Specifications allows for vendor-agnostic cybertime response to attacks.</p>
<p>The Integrated Adaptive Cyber Defense (IACD) framework defines a collection of activities, based on the traditional OODA (Observe–Orient–Decide–Act) Loop [IACD]:</p>
<ul>
<li>Sensing: gathering of data regarding system activities</li>
<li>Sense Making: evaluating data using analytics to understand what's happening</li>
<li>Decision Making: determining a course-of-action to respond to system events</li>
<li>Acting: Executing the course-of-action</li>
</ul>
<p>The goal of OpenC2 is to enable coordinated defense in cyber-relevant time between decoupled blocks that perform cyber defense functions. OpenC2 focuses on the Acting portion of the IACD framework; the assumption that underlies the design of OpenC2 is that the sensing/ analytics have been provisioned and the decision to act has been made. This goal and these assumptions guides the design of OpenC2:</p>
<ul>
<li><strong>Technology Agnostic:</strong> The OpenC2 language defines a set of abstract atomic cyber defense actions in a platform and product agnostic manner</li>
<li><strong>Concise:</strong> An OpenC2 command is intended to convey only the essential information required to describe the action required and can be represented in a very compact form for communications-constrained environments</li>
<li><strong>Abstract:</strong> OpenC2 commands and responses are defined abstractly and can be encoded and transferred via multiple schemes as dictated by the needs of different implementation environments</li>
<li><strong>Extensible:</strong> While OpenC2 defines a core set of actions and targets for cyber defense, the language is expected to evolve with cyber defense technologies, and permits extensions to accommodate new cyber defense technologies.</li>
</ul>
<h2 id="18-purpose-and-scope">1.8 Purpose and Scope</h2>
<p>A ‘Stateless Packet Filter’ (SLPF) is a policy enforcement mechanism that restricts or permits traffic based on static values such as source address, destination address, and/or port numbers. A Stateless-Packet-Filter does not consider traffic patterns, connection state, data flows, applications, or payload information. The scope of this profile is limited to Stateless-Packet-Filtering herein referred to as SLPF.</p>
<p>This actuator profile specifies the set of actions, targets, specifiers, and command arguments that integrates SLPF functionality with the Open Command and Control (OpenC2) command set. Through this command set, cyber security orchestrators may gain visibility into and provide control over the SLPF functionality in a manner that is independent of the instance of the SLPF function.</p>
<p>All components, devices and systems that provide SLPF functionality will implement the OpenC2 ACTIONS, TARGETS, SPECIFIERS and ARGS identified as required in this document. Actions that are applicable, but not necessarily required, for SLPF will be identified as optional.</p>
<p>The purpose of this document is to:</p>
<ul>
<li>Identify the required and optional OpenC2 ACTIONS for actuators with SLPF functionality.</li>
<li>Identify the required and optional TARGET types and associated specifiers for each action in the SLPF class of actuators.</li>
<li>Identify ACTUATOR-SPECIFIERS, ACTUATOR-ARGS and COMMAND-ARGS for each action-target pair that are applicable and/or unique to the SLPF class of actuators</li>
<li>Annotate each Action/ Target pair with a justification and example, and provide sample OpenC2 commands to a SLPF with corresponding responses</li>
<li>Provide an abstract schema that captures the specifiers and options for a SLPF</li>
</ul>
<p>This SLPF profile:</p>
<ul>
<li>Does not define or implement ACTIONS beyond those defined in Version 1.0 of the Language Specification.</li>
<li>Is consistent with version 1.0 of the OpenC2 Language Specification</li>
</ul>
<p>Cyber defense systems that are utilizing OpenC2 may require the following components to implement the SLPF profile:</p>
<ul>
<li>OpenC2 Producers: Devices that send commands, receive responses, and manage the execution of commands involving one or more SLPF or other actuators with SLPF capability. The OpenC2 producer needs <em>a priori</em> knowledge of which commands the actuator can process and execute, therefore must understand the profiles for any device that it intends to command.</li>
<li>OpenC2 Consumers: Devices or instances that provide stateless packet filtering functions. Typically these are actuators that execute the cyber defense function, but could be orchestrators (i.e., a device or instance that forwards commands to the actuator).</li>
</ul>
<p>Though cyber defense components, devices, systems and/or instances may may implement multiple actuator profiles, a particular OpenC2 message may reference at most a single actuator profile. The scope of this document is limited to SLPF.</p>
<p>This specification is organized into three major sections.</p>
<p>Section One (this section) provides a nonnormative overview of the suite of specifications that realize OpenC2. This section provides references as well as defines the scope and purpose of this specification.</p>
<p>Section Two (normative) binds this particular profile to the OpenC2 Language Specification. Section Two enumerates the components of the language specification that are meaningful in the context of SLPF and defines components that are applicable to this distinct profile. Section Two also defines the commands (i.e., the action target pairs) that are permitted in the context of SLPF.</p>
<p>Section Three (normative) presents definitive criteria for conformance so that cyber security stakeholders can be assured that their products, instances and/or integrations are compatible with OpenC2.</p>
<p>This specification provides three non-normative Annexes. OpenC2 is intended for machine to machine interactions, therefore a schema for SLPF and the applicable portions of the OpenC2 Language schema are provided to facilitate development. There is also an Annex that provides multiple examples of SLPF commands (JSON serialization).</p>
<hr />
<h1 id="2-openc2-language-binding">2 OpenC2 Language Binding</h1>
<p>This section defines the set of ACTIONS, TARGETS, SPECIFIERS, and ARGS that are meaningful in the context of an SLPF. This section also describes the format of the response frame's status and results field. This section organized into three major subsections; Command Components, Response Components and Commands.</p>
<h2 id="21-openc2-command-components">2.1 OpenC2 Command Components</h2>
<p>The components of an OpenC2 command include ACTIONS, TARGETS, ACTUATORS and associated ARGS and SPECIFIERS. Appropriate aggregation of the components will define a command-body that is meaningful in the context of an SLPF.</p>
<p>This specification identifies the applicable components of an OpenC2 command. The components of an OpenC2 command include:</p>
<ul>
<li>ACTION: A subset of the ACTIONs defined in the OpenC2 Language specification that are meaningful in the context of a SLPF.
<ul>
<li>This profile does not define ACTIONs that are external to Version 1.0 of the OpenC2 Language Specification.</li>
<li>This profile MAY augment the definition of the actions in the context of a SLPF.</li>
<li>This profile SHALL NOT define ACTIONs in a manner that is inconsistent with version 1.0 of the OpenC2 language specification.</li>
</ul></li>
<li>TARGET: A subset of the TARGETs and target-specifiers defined in the Language specification that are meaningful in the context of SLPF and one TARGET (and its associated specifier) that is defined in this specification.</li>
<li>ARGS: A subset of the COMMAND-ARGS defined in the Language Specification and a set of ACTUATOR-ARGS defined in this specification.</li>
<li>ACTUATOR: A set of specifiers defined in this specification that are meaningful in the context of SLPF.</li>
</ul>
<h3 id="211-actions">2.1.1 Actions</h3>
<p>Table 2.1.1-1 presents the OpenC2 actions defined in version 1.0 of the Language Specification which are meaningful in the context of an SLPF. The particular action/target pairs that are required or optional are presented in section 2.3.</p>
<p><strong>Table 2.1.1-1. Actions Applicable to SLPF</strong></p>
<p><strong><em>Type: Action (Enumerated)</em></strong></p>
<table>
<thead>
<tr class="header">
<th style="text-align: left;">ID</th>
<th style="text-align: left;">Name</th>
<th style="text-align: left;">Description</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td style="text-align: left;">3</td>
<td style="text-align: left;"><strong>query</strong></td>
<td style="text-align: left;">Initiate a request for information. Used to communicate the supported options and determine the state or settings.</td>
</tr>
<tr class="even">
<td style="text-align: left;">6</td>
<td style="text-align: left;"><strong>deny</strong></td>
<td style="text-align: left;">Prevent traffic or access.</td>
</tr>
<tr class="odd">
<td style="text-align: left;">8</td>
<td style="text-align: left;"><strong>allow</strong></td>
<td style="text-align: left;">Permit traffic or access.</td>
</tr>
<tr class="even">
<td style="text-align: left;">16</td>
<td style="text-align: left;"><strong>update</strong></td>
<td style="text-align: left;">Instructs the actuator to update its configuration by retrieving and processing a configuration file and update.</td>
</tr>
<tr class="odd">
<td style="text-align: left;">20</td>
<td style="text-align: left;"><strong>delete</strong></td>
<td style="text-align: left;">Remove an access rule.</td>
</tr>
</tbody>
</table>
<hr />
<h3 id="212-targets">2.1.2 Targets</h3>
<h4 id="2121-common-targets">2.1.2.1 Common Targets</h4>
<p>Table 2.1.2-1 lists the TARGETs defined in the OpenC2 Language specification that are applicable to SLPF. The particular action/target pairs that are required or optional are presented in section 2.3.</p>
<p><strong>Table 2.1.2-1. Targets Applicable to SLPF</strong></p>
<p><strong><em>Type: Target (Choice)</em></strong></p>
<table>
<thead>
<tr class="header">
<th style="text-align: left;">ID</th>
<th style="text-align: left;">Name</th>
<th style="text-align: left;">Type</th>
<th style="text-align: left;">Description</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td style="text-align: left;">10</td>
<td style="text-align: left;"><strong>file</strong></td>
<td style="text-align: left;">File</td>
<td style="text-align: left;">Properties of a file.</td>
</tr>
<tr class="even">
<td style="text-align: left;">11</td>
<td style="text-align: left;"><strong>ip_addr</strong></td>
<td style="text-align: left;">IP-Addr</td>
<td style="text-align: left;">The representation of one or more IP addresses (either version 4 or version 6) expressed using CIDR notation.</td>
</tr>
<tr class="odd">
<td style="text-align: left;">15</td>
<td style="text-align: left;"><strong>ip_connection</strong></td>
<td style="text-align: left;">IP-Connection</td>
<td style="text-align: left;">A network connection that originates from a source and is addressed to a destination. Source and destination addresses may be either IPv4 or IPv6; both should be the same version</td>
</tr>
<tr class="even">
<td style="text-align: left;">16</td>
<td style="text-align: left;"><strong>features</strong></td>
<td style="text-align: left;">Features</td>
<td style="text-align: left;">A set of items such as action target pairs, profiles versions, options that are supported by the actuator. The target is used with the query action to determine an actuator's capabilities.</td>
</tr>
<tr class="odd">
<td style="text-align: left;">1024</td>
<td style="text-align: left;"><strong>slpf</strong></td>
<td style="text-align: left;">slpf:Target</td>
<td style="text-align: left;">Targets defined in the Stateless Packet Filter profile.</td>
</tr>
</tbody>
</table>
<h4 id="2122-slpf-targets">2.1.2.2 SLPF Targets</h4>
<p>The slpf:Target type is defined in this specification and is referenced under the slpf namespace. Implementations that choose to include this type MUST import it in accordance with the procedures defined in section 2.2.6 of Version 1.0 of the OpenC2 Language Specification:</p>
<ol>
<li>The unique name of the SLPF schema is <code>oasis-open.org/openc2/v1.0/ap-slpf</code></li>
<li>The namespace identifier (nsid) referring to the SLPF schema is: <code>slpf</code></li>
<li>The list of types imported from the SLPF schema is: <code>Target</code>, <code>Actuator</code>, <code>Args</code>, and <code>Results</code>.</li>
<li>The definitions of and conformance requirements for these types are contained in this document.</li>
</ol>
<p><strong><em>Type: Target (Choice)</em></strong></p>
<table>
<thead>
<tr class="header">
<th style="text-align: left;">ID</th>
<th style="text-align: left;">Name</th>
<th style="text-align: left;">Type</th>
<th style="text-align: left;">Description</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td style="text-align: left;">1</td>
<td style="text-align: left;"><strong>rule_number</strong></td>
<td style="text-align: left;">Rule-ID</td>
<td style="text-align: left;">Immutable identifier assigned when a rule is created, Identifies a rule to be deleted.</td>
</tr>
</tbody>
</table>
<p>Implementations that choose to support slpf:Target MUST support the <strong>rule_number</strong> target.</p>
<h3 id="213-command-arguments">2.1.3 Command Arguments</h3>
<p>Arguments provide additional precision to a command by including information such as how, when, or where a command is to be executed. Table 2.1.3-1 summarizes the command arguments defined in Version 1.0 of the OpenC2 Language Specification as they relate to SLPF functionality. Table 2.1.3-2 summarizes the command arguments that are defined in this specification.</p>
<h4 id="2131-common-args">2.1.3.1 Common Args</h4>
<p>Table 2.1.3.1-1 lists the command arguments defined in the OpenC2 Language specification that are applicable to SLPF.</p>
<p><strong>Table 2.1.3-1. Command Arguments applicable to SLPF</strong></p>
<p><strong><em>Type: Args (Map)</em></strong></p>
<table>
<thead>
<tr class="header">
<th style="text-align: left;">ID</th>
<th style="text-align: left;">Name</th>
<th style="text-align: left;">Type</th>
<th style="text-align: left;">#</th>
<th style="text-align: left;">Description</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td style="text-align: left;">1</td>
<td style="text-align: left;"><strong>start_time</strong></td>
<td style="text-align: left;">Date-Time</td>
<td style="text-align: left;">0..1</td>
<td style="text-align: left;">The specific date/time to initiate the action</td>
</tr>
<tr class="even">
<td style="text-align: left;">2</td>
<td style="text-align: left;"><strong>stop_time</strong></td>
<td style="text-align: left;">Date-Time</td>
<td style="text-align: left;">0..1</td>
<td style="text-align: left;">The specific date/time to terminate the action</td>
</tr>
<tr class="odd">
<td style="text-align: left;">3</td>
<td style="text-align: left;"><strong>duration</strong></td>
<td style="text-align: left;">Duration</td>
<td style="text-align: left;">0..1</td>
<td style="text-align: left;">The length of time for an action to be in effect</td>
</tr>
<tr class="even">
<td style="text-align: left;">4</td>
<td style="text-align: left;"><strong>response_requested</strong></td>
<td style="text-align: left;">Response-Type</td>
<td style="text-align: left;">0..1</td>
<td style="text-align: left;">The type of response required for the action: <code>none</code>, <code>ack</code>, <code>status</code>, <code>complete</code>.</td>
</tr>
<tr class="odd">
<td style="text-align: left;">1024</td>
<td style="text-align: left;"><strong>slpf</strong></td>
<td style="text-align: left;">slpf:Args</td>
<td style="text-align: left;">0..1</td>
<td style="text-align: left;">Command arguments defined in the Stateless Packet Filter profile</td>
</tr>
</tbody>
</table>
<p>The semantics/requirements as they relate to common arguments:</p>
<ul>
<li>start-time/end-time/duration
<ul>
<li>If none are specified then the start time is now, the end time is never, and the duration is infinity</li>
<li>Only two of the three are allowed on any given command and the third is derived from the equation end-time = start-time + duration</li>
<li>If only start time is specified then end-time is never and duration is infinity</li>
<li>If only end time is specified then start-time is now and duration is derived</li>
<li>If only duration is specified then start-time is now and end-time is derived</li>
</ul></li>
<li>response_requested
<ul>
<li>If absent or not explicitly set in an OpenC2 Command, then a Consumer MUST respond the same as response_type <code>complete</code>.</li>
</ul></li>
</ul>
<h4 id="2132-slpf-args">2.1.3.2 SLPF Args</h4>
<p>The command arguments defined in this document are referenced under the slpf namespace.</p>
<p><strong>Table 2.1.3-2. Command Arguments Unique to SLPF</strong></p>
<p><strong><em>Type: Args (Map)</em></strong></p>
<table>
<thead>
<tr class="header">
<th style="text-align: left;">ID</th>
<th style="text-align: left;">Name</th>
<th style="text-align: left;">Type</th>
<th style="text-align: left;">#</th>
<th style="text-align: left;">Description</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td style="text-align: left;">1</td>
<td style="text-align: left;"><strong>drop_process</strong></td>
<td style="text-align: left;">Drop-Process</td>
<td style="text-align: left;">0..1</td>
<td style="text-align: left;">Specifies how to handle denied packets</td>
</tr>
<tr class="even">
<td style="text-align: left;">2</td>
<td style="text-align: left;"><strong>running</strong></td>
<td style="text-align: left;">Boolean</td>
<td style="text-align: left;">0..1</td>
<td style="text-align: left;">Normal operations assumes any change to a device are to be implemented as persistent changes. Setting the running modifier to TRUE results in a change that is not persistent in the event of a reboot or restart.</td>
</tr>
<tr class="odd">
<td style="text-align: left;">3</td>
<td style="text-align: left;"><strong>direction</strong></td>
<td style="text-align: left;">Direction</td>
<td style="text-align: left;">0..1</td>
<td style="text-align: left;">Specifies whether to apply rules to incoming or outgoing traffic. If omitted, rules are applied to both.</td>
</tr>
<tr class="even">
<td style="text-align: left;">4</td>
<td style="text-align: left;"><strong>insert_rule</strong></td>
<td style="text-align: left;">Rule-ID</td>
<td style="text-align: left;">0..1</td>
<td style="text-align: left;">Specifies the identifier of the rule within a list, typically used in a top-down rule list.</td>
</tr>
</tbody>
</table>
<p><strong><em>Type: Drop-Process (Enumerated)</em></strong></p>
<table>
<thead>
<tr class="header">
<th style="text-align: left;">ID</th>
<th style="text-align: left;">Name</th>
<th style="text-align: left;">Description</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td style="text-align: left;">1</td>
<td style="text-align: left;"><strong>none</strong></td>
<td style="text-align: left;">Drop the packet and do not send a notification to the source of the packet.</td>
</tr>
<tr class="even">
<td style="text-align: left;">2</td>
<td style="text-align: left;"><strong>reject</strong></td>
<td style="text-align: left;">Drop the packet and send an ICMP host unreachable (or equivalent) to the source of the packet.</td>
</tr>
<tr class="odd">
<td style="text-align: left;">3</td>
<td style="text-align: left;"><strong>false_ack</strong></td>
<td style="text-align: left;">Drop the traffic and send a false acknowledgement.</td>
</tr>
</tbody>
</table>
<p><strong><em>Type: Direction (Enumerated)</em></strong></p>
<table>
<thead>
<tr class="header">
<th style="text-align: left;">ID</th>
<th style="text-align: left;">Name</th>
<th style="text-align: left;">Description</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td style="text-align: left;">1</td>
<td style="text-align: left;"><strong>ingress</strong></td>
<td style="text-align: left;">Apply rules to incoming traffic only</td>
</tr>
<tr class="even">
<td style="text-align: left;">2</td>
<td style="text-align: left;"><strong>egress</strong></td>
<td style="text-align: left;">Apply rules to outgoing traffic only</td>
</tr>
</tbody>
</table>
<p><strong><em>Type: Rule-ID</em></strong></p>
<table>
<thead>
<tr class="header">
<th style="text-align: left;">Type Name</th>
<th style="text-align: left;">Type</th>
<th style="text-align: left;">Description</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td style="text-align: left;"><strong>Rule-ID</strong></td>
<td style="text-align: left;">Integer</td>
<td style="text-align: left;">Access rule identifier</td>
</tr>
</tbody>
</table>
<p>The semantics/ requirements as they relate to SLPF arguments:</p>
<ul>
<li>insert_rule:
<ul>
<li>The value MUST be immutable - i.e. the identifier assigned to an access rule at creation must not change over the lifetime of that rule.</li>
<li>The value MUST be unique within the scope of a command sent to an openc2 consumer - i.e. a rule_number maps to exactly one deny <target> or allow <target></li>
</ul></li>
<li>directionality:
<ul>
<li>Entities that do not support directionality MUST NOT reply with 200 OK and SHOULD return a 501 error code.</li>
<li>If absent, then the command MUST apply to both.</li>
</ul></li>
<li>drop_process: If absent or not explicitly set, then the actuator MUST NOT send any notification to the source of the packet</li>
<li>running: If absent or not explicitly set, then the value is FALSE and any changes are persistent.</li>
</ul>
<h3 id="214-actuator-specifiers">2.1.4 Actuator Specifiers</h3>
<p>An ACTUATOR is the entity that provides the functionality and performs the action. The ACTUATOR executes the ACTION on the TARGET. In the context of this profile, the actuator is the SLPF and the presence of one or more specifiers further refine which actuator(s) shall execute the action.</p>
<p>Table 2.1.4-1 lists the specifiers that are applicable to the SPLF actuator. Annex C provides sample commands with the use of specifiers.</p>
<p>The actuator specifiers defined in this document are referenced under the slpf namespace.</p>
<p><strong>Table 2.1.4-1. SLPF Specifiers</strong></p>
<p><strong><em>Type: Specifiers (Map)</em></strong></p>
<table>
<thead>
<tr class="header">
<th style="text-align: left;">ID</th>
<th style="text-align: left;">Name</th>
<th style="text-align: left;">Type</th>
<th style="text-align: left;">#</th>
<th style="text-align: left;">Description</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td style="text-align: left;">1</td>
<td style="text-align: left;"><strong>hostname</strong></td>
<td style="text-align: left;">String</td>
<td style="text-align: left;">0..1</td>
<td style="text-align: left;">RFC 1123 hostname (can be a domain name or IP address) for a particular device with SLPF functionality</td>
</tr>
<tr class="even">
<td style="text-align: left;">2</td>
<td style="text-align: left;"><strong>named_group</strong></td>
<td style="text-align: left;">String</td>
<td style="text-align: left;">0..1</td>
<td style="text-align: left;">User defined collection of devices with SLPF functionality</td>
</tr>
<tr class="odd">
<td style="text-align: left;">3</td>
<td style="text-align: left;"><strong>asset_id</strong></td>
<td style="text-align: left;">String</td>
<td style="text-align: left;">0..1</td>
<td style="text-align: left;">Unique identifier for a particular SLPF</td>
</tr>
<tr class="even">
<td style="text-align: left;">4</td>
<td style="text-align: left;"><strong>asset_tuple</strong></td>
<td style="text-align: left;">String</td>
<td style="text-align: left;">0..10</td>
<td style="text-align: left;">Unique tuple identifier for a particular SLPF consisting of a list of up to 10 strings</td>
</tr>
</tbody>
</table>
<h2 id="22-openc2-response-components">2.2 OpenC2 Response Components</h2>
<p>Response messages originate from the ACTUATOR as a result of a command.</p>
<p>Responses associated with required actions MUST be implemented. Implementations that include optional ACTIONS MUST implement the RESPONSE associated with the implemented ACTION. Additional details regarding the command and associated response are captured in section 2.3. Examples will be provided in Annex C.</p>
<h3 id="221-common-results">2.2.1 Common Results</h3>
<p>Table 2.2.1-1 lists the results defined in the OpenC2 Language specification that are applicable to SLPF.</p>
<p><strong>Table 2.2.1-1. Results Applicable to SLPF</strong></p>
<p><strong><em>Type: OpenC2-Response (Map)</em></strong></p>
<table>
<thead>
<tr class="header">
<th style="text-align: left;">ID</th>
<th style="text-align: left;">Name</th>
<th style="text-align: left;">Type</th>
<th style="text-align: left;">#</th>
<th style="text-align: left;">Description</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td style="text-align: left;">1</td>
<td style="text-align: left;"><strong>status</strong></td>
<td style="text-align: left;">Status-Code</td>
<td style="text-align: left;">0..1</td>
<td style="text-align: left;">An integer status code</td>
</tr>
<tr class="even">
<td style="text-align: left;">2</td>
<td style="text-align: left;"><strong>status_text</strong></td>
<td style="text-align: left;">String</td>
<td style="text-align: left;">0..1</td>
<td style="text-align: left;">A free-form human-readable description of the response status</td>
</tr>
<tr class="odd">
<td style="text-align: left;">6</td>
<td style="text-align: left;"><strong>versions</strong></td>
<td style="text-align: left;">Version</td>
<td style="text-align: left;">0..n</td>
<td style="text-align: left;">List of OpenC2 language versions supported by this actuator</td>
</tr>
<tr class="even">
<td style="text-align: left;">7</td>
<td style="text-align: left;"><strong>profiles</strong></td>
<td style="text-align: left;">jadn:Uname</td>
<td style="text-align: left;">0..n</td>
<td style="text-align: left;">List of profiles supported by this actuator</td>
</tr>
<tr class="odd">
<td style="text-align: left;">8</td>
<td style="text-align: left;"><strong>schema</strong></td>
<td style="text-align: left;">jadn:Schema</td>
<td style="text-align: left;">0..1</td>
<td style="text-align: left;">Syntax of the OpenC2 language elements supported by this actuator</td>
</tr>
<tr class="even">
<td style="text-align: left;">9</td>
<td style="text-align: left;"><strong>pairs</strong></td>
<td style="text-align: left;">Action-Targets</td>
<td style="text-align: left;">0..n</td>
<td style="text-align: left;">List of targets applicable to each supported action</td>
</tr>
<tr class="odd">
<td style="text-align: left;">10</td>
<td style="text-align: left;"><strong>rate_limit</strong></td>
<td style="text-align: left;">Number</td>
<td style="text-align: left;">0..1</td>
<td style="text-align: left;">Maximum number of requests per minute supported by design or policy</td>
</tr>
<tr class="even">
<td style="text-align: left;">1024</td>
<td style="text-align: left;"><strong>slpf</strong></td>
<td style="text-align: left;">slpf:Results</td>
<td style="text-align: left;">0..1</td>
<td style="text-align: left;">Response data defined in the Stateless Packet Filtering profile</td>
</tr>
</tbody>
</table>
<p>Table 2.2.1-2 lists the Status Codes defined in the OpenC2 Language specification that are applicable to SLPF.</p>
<p><strong>Table 2.2.1-2. Status Codes</strong></p>
<p><strong><em>Type: Status-Code (Enumerated.ID)</em></strong></p>
<table>
<thead>
<tr class="header">
<th style="text-align: left;">Value</th>
<th style="text-align: left;">Description</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td style="text-align: left;">102</td>
<td style="text-align: left;">Processing. Command received but action not necessarily complete</td>
</tr>
<tr class="even">
<td style="text-align: left;">200</td>
<td style="text-align: left;">OK.</td>
</tr>
<tr class="odd">
<td style="text-align: left;">400</td>
<td style="text-align: left;">Bad Request. Unable to process command, parsing error</td>
</tr>
<tr class="even">
<td style="text-align: left;">500</td>
<td style="text-align: left;">Internal Error. For response type complete, one of the following MAY apply:<br> * Cannot access file or path<br> * Rule number currently in use<br> * Rule not updated</td>
</tr>
<tr class="odd">
<td style="text-align: left;">501</td>
<td style="text-align: left;">Not implemented. For response type complete, one of the following MAY apply:<br> * Target not supported<br> * Option not supported<br> * Command not supported</td>
</tr>
</tbody>
</table>
<h3 id="222-slpf-results">2.2.2 SLPF Results</h3>
<p>The results defined in this document are presented in Table 2.2-2. The results are referenced under the slpf namespace within the OpenC2-Response type defined in the OpenC2 language specification.</p>
<p><strong>Table 2.2-2. SLPF Results</strong></p>
<p><strong><em>Type: Results (Map)</em></strong></p>
<table>
<thead>
<tr class="header">
<th style="text-align: left;">Type Name</th>
<th style="text-align: left;">Type</th>
<th style="text-align: left;">Description</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td style="text-align: left;"><strong>rule_number</strong></td>
<td style="text-align: left;">Rule-ID</td>
<td style="text-align: left;">Rule identifier returned from allow or deny command.</td>
</tr>
</tbody>
</table>
<h2 id="23-openc2-commands">2.3 OpenC2 Commands</h2>
<p>An OpenC2 command consists of an ACTION/TARGET pair and associated SPECIFIERS and ARGUMENTs. This section enumerates the allowed commands, identify which are required or optional to implement, and present the associated responses.</p>
<p>Table 2.3-1 defines the commands allowed by the SLPF profile and indicates if implementation of the command is required or optional for Openc2 Producers and/or Openc2 Consumers. An ACTION (the top row in Table 2.3-1) paired with a TARGET (the first column in Table 2.3-1) defines an allowable command. The subsequent subsections provide the property tables applicable to each OpenC2 command.</p>
<p><strong>Table 2.3-1. Command Matrix</strong></p>
<table>
<thead>
<tr class="header">
<th style="text-align: left;"></th>
<th style="text-align: left;">Allow</th>
<th style="text-align: left;">Deny</th>
<th style="text-align: left;">Query</th>
<th style="text-align: left;">Delete</th>
<th style="text-align: left;">Update</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td style="text-align: left;"><strong>ip_connection</strong></td>
<td style="text-align: left;">required</td>
<td style="text-align: left;">required</td>
<td style="text-align: left;"></td>
<td style="text-align: left;"></td>
<td style="text-align: left;"></td>
</tr>
<tr class="even">
<td style="text-align: left;"><strong>ip_addr</strong></td>
<td style="text-align: left;">required</td>
<td style="text-align: left;">required</td>
<td style="text-align: left;"></td>
<td style="text-align: left;"></td>
<td style="text-align: left;"></td>
</tr>
<tr class="odd">
<td style="text-align: left;"><strong>features</strong></td>
<td style="text-align: left;"></td>
<td style="text-align: left;"></td>
<td style="text-align: left;">required</td>
<td style="text-align: left;"></td>
<td style="text-align: left;"></td>
</tr>
<tr class="even">
<td style="text-align: left;"><strong>slpf:rule_number</strong></td>
<td style="text-align: left;"></td>
<td style="text-align: left;"></td>
<td style="text-align: left;"></td>
<td style="text-align: left;">optional</td>
<td style="text-align: left;"></td>
</tr>
<tr class="odd">
<td style="text-align: left;"><strong>file</strong></td>
<td style="text-align: left;"></td>
<td style="text-align: left;"></td>
<td style="text-align: left;"></td>
<td style="text-align: left;"></td>
<td style="text-align: left;">optional</td>
</tr>
</tbody>
</table>
<p>Table 2.3-2 defines the command arguments that are allowed for a particular command by the SLPF profile. A command (the top row in Table 2.3-2) paired with an argument (the first column in Table 2.3-2) defines an allowable combination. The subsection identified at the intersection of the command/ argument provides details applicable to each command as influenced by the argument.</p>
<p><strong>Table 2.3-2. Command Arguments Matrix</strong></p>
<table>
<thead>
<tr class="header">
<th style="text-align: left;"></th>
<th style="text-align: left;">Allow<br><target></th>
<th style="text-align: left;">Deny <target></th>
<th style="text-align: left;">Query features</th>
<th style="text-align: left;">Delete slpf:rule_number</th>
<th style="text-align: left;">Update file</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td style="text-align: left;"><strong>response</strong></td>
<td style="text-align: left;">2.3.1</td>
<td style="text-align: left;">2.3.2</td>
<td style="text-align: left;">2.3.3.1</td>
<td style="text-align: left;">2.3.4.1</td>
<td style="text-align: left;">2.3.5.1</td>
</tr>
<tr class="even">
<td style="text-align: left;"><strong>start-time</strong></td>