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<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
<link rel="stylesheet" href="tablestyle.css">
<meta charset="utf-8" />
<title>Web of Things (WoT) Security and Privacy Guidelines</title>
<script class="remove" async="" src="https://www.w3.org/Tools/respec/respec-w3c-common"></script>
<script class="remove">
var respecConfig = {
specStatus: "ED"
, noRecTrack: "true"
, processVersion: 2017
, shortName: "wot-security"
, copyrightStart: 2017
, wg: "Web of Things Working Group"
, wgURI: "https://www.w3.org/WoT/WG/"
, wgPublicList: "public-wot-wg"
, edDraftURI: "https://w3c.github.io/wot-security/"
, githubAPI: "https://api.github.com/repos/w3c/wot-security"
, issueBase: "https://www.github.com/w3c/wot-security/issues"
, editors: [
{
name: "Elena Reshetova"
, w3cid: "99327"
, company: "Intel Corp."
, companyURL: "https://www.intel.com/"
},
{
name: "Michael McCool"
, w3cid: "93137"
, company: "Intel Corp."
, companyURL: "https://www.intel.com/"
}
]
, otherLinks: [
{
key: "Contributors"
, data: [
{
value: "In the GitHub repository"
, href: "https://github.com/w3c/wot-security/graphs/contributors"
}
]
}
, {
key: "Repository",
data: [
{
value: "We are on GitHub",
href: "https://github.com/w3c/wot-security/"
}
, {
value: "File a bug",
href: "https://github.com/w3c/wot-security/issues"
}
, {
value: "Contribute",
href: "https://github.com/w3c/wot-security/pulls"
}
]
}
]
, localBiblio: {
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href: "https://tools.ietf.org/html/rfc5116"
, title: "An Interface and Algorithms for Authenticated Encryption"
, publisher: "IETF"
, date: "January 2008"
},
"CoRE-RD": {
href: "https://tools.ietf.org/html/draft-ietf-core-resource-directory-11"
, title: "CoRE Resource Directory"
, status: "Internet-Draft"
, publisher: "IETF"
, date: "03 July 2017"
},
"Ocf17": {
href: "https://openconnectivity.org/specs/OCF_Security_Specification_v1.0.0.pdf"
, title: "The OCF Security Specification, version 1.0.0"
, publisher: "OCF"
, date: "June 2017"
},
"JWE15": {
href: "https://tools.ietf.org/html/rfc7516"
, title: "JSON Web Encryption (JWE)"
, publisher: "IETF"
, date: "May 2015"
},
"JWS15": {
href: "https://tools.ietf.org/html/rfc7515"
, title: "JSON Web Signature (JWS)"
, publisher: "IETF"
, date: "May 2015"
},
"JWT15": {
href: "https://tools.ietf.org/html/rfc7519"
, title: "JSON Web Token (JWT)"
, publisher: "IETF"
, date: "May 2015"
},
"CBOR17": {
href: "https://tools.ietf.org/pdf/draft-ietf-ace-cbor-web-token-07.pdf"
, title: "CBOR Web Token (CWT)"
, status: "Internet-Draft"
, publisher: "IETF"
, date: "June 2017"
},
"OSCOAP17": {
href: "https://tools.ietf.org/pdf/draft-ietf-core-object-security-04.pdf"
, title: "Object Security of CoAP (OSCOAP)"
, status: "Internet-Draft"
, publisher: "IETF"
, date: "July 2017"
},
"COSE17": {
href: "https://tools.ietf.org/html/rfc8152"
, title: "CBOR Object Signing and Encryption (COSE)"
, publisher: "IETF"
, date: "May 2017"
},
"Bel89": {
authors: ["S. Bellovin"]
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, pages: "32-48"
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, title: "Web Security in the Real World"
, publisher: "Workshop on Improving Trust in the Online Marketplace, NIST"
, date: "April 2013"
},
"Ber14": {
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, href: "http://www.cloudidentity.com/blog/2014/04/22/authentication-protocols-web-ux-and-web-api/"
, title: "Authentication Protocols, Web UX and Web API"
, date: "April 2014"
},
"Bor14": {
authors: ["C. Bormann", "et al."]
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, title: "Terminology for Constrained-Node Networks"
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},
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authors: ["C. Brubaker", "et al."]
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, publisher: "IEEE Security Privacy"
, date: "2014"
, pages: "114-129"
},
"Coo13": {
authors: ["A. Cooper", "et al"]
, href: "https://tools.ietf.org/html/rfc6973"
, title: "Privacy Considerations for Internet Protocols"
, publisher: "IETF RFC 6973 (IAB Guideline)"
, date: "July 2013"
},
"Lea05": {
authors: ["P. Leach", "et al"]
, href: "https://tools.ietf.org/html/rfc4122"
, title: "A Universally Unique IDentifier (UUID) URN Namespace"
, publisher: "IETF RFC 4122"
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},
"Dur13": {
authors: ["Z. Durumeric", "et al."]
, href: "https://conferences.sigcomm.org/imc/2013/papers/imc257-durumericAemb.pdf"
, title: "Analysis of the HTTPS Certificate Ecosystem"
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, date: "October 2013"
},
"Ell00": {
authors: ["C. Ellison", "B. Schneier"]
, href: "https://www.schneier.com/paper-pki.pdf"
, title: "Ten Risks of PKI: What You’re not Being Told about Public Key Infrastructure"
, publisher: "Computer Security Journal, v 16, n 1,"
, date: "2000"
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authors: ["K. Fu", "et al."]
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, title: "Dos and Don’ts of Client Authentication on the Web"
, publisher: "Proc. 10th USENIX Security Symposium"
, date: "August 2001"
},
"Garcia17": {
authors: ["O. Garcia-Morchon", "S. Kumar", "M. Sethi"]
, title: "State-of-the-Art and Challenges for the Internet of Things Security"
, href: "https://datatracker.ietf.org/doc/draft-irtf-t2trg-iot-seccons/"
},
"Geo12": {
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"Gol03": {
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},
"IETFACE": {
title: "IETF Authentication and Authorization for Constrained Environments (ACE)"
, href: "https://tools.ietf.org/wg/ace/"
},
"Iic15": {
authors: ["Industrial Internet Consortium"]
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},
"IicRA17": {
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},
"IicSF16": {
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, publisher: "IIC:PUB:G4:V1.0:PB:20160926"
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"ISF17": {
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"Owa17": {
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"Sch14": {
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"Sch99": {
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"Vol00": {
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"ITUx1520": {
authors: ["ITU-T SG17"]
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, publisher: "International Telecommunication Union"
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},
"ITUx1524": {
authors: ["ITU-T SG17"]
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, title: "ITU-T Rec. X.1524 Common weakness enumeration"
, publisher: "International Telecommunication Union"
, date: "March 2012"
},
"Owa17": {
authors: ["OWASP"]
, href: "https://www.owasp.org/index.php/Threat_Risk_Modeling"
, title: "Threat Risk Modeling"
, publisher: "OWASP"
, date: "Jan 2017"
},
"Owa18": {
authors: ["OWASP"]
, href: "https://www.owasp.org/index.php/Web_Service_Security_Testing_Cheat_Sheet"
, title: "Web Service Security Testing"
, publisher: "OWASP"
, date: "Aug 2018"
},
"FuzzCoAP": {
href: "https://github.com/bsmelo/fuzzcoap"
, title: "FuzzCoAP - Fuzzing for Robustness and Security Testing of CoAP Servers"
},
"Wfuzz": {
href: "http://www.edge-security.com/wfuzz.php"
, title: "Wfuzz. The web application Bruteforcer"
},
"Snyk": {
href: "https://snyk.io/"
, title: "A developer-first solution that automates finding and fixing vulnerabilities in your dependencies"
},
"OWASP-Dependency-Check": {
href: "https://www.owasp.org/index.php/OWASP_Dependency_Check"
, title: "OWASP Dependency Check"
},
"w3af": {
href: "http://w3af.org/"
, title: "Web Application Attack and Audit Framework"
},
"Burp": {
href: "https://portswigger.net/burp"
, title: "Burp Suite Web vulnerability scanner"
},
"Protecode": {
href: "https://www.synopsys.com/software-integrity/security-testing/software-composition-analysis.html"
, title: "Black Duck Software Composition Analysis"
},
"PeachPit-COAP": {
href: "https://www.peach.tech/wp-content/uploads/CoAP_DataSheet.pdf"
, title: "CoAP Peach Pit User Guide"
},
"wapiti": {
href: "http://wapiti.sourceforge.net/"
, title: "Wapiti - The web-application vulnerability scanner"
},
"Coverity": {
href: "https://community.synopsys.com/s/article/Coverity-Tutorial-Introduction-to-Coverity"
, title: "Coverity Tutorial: Introduction to Coverity"
},
"Klocwork": {
href: "https://www.roguewave.com/products-services/klocwork"
, title: "Klocwork. Faster delivery of secure, reliable, and conformant code"
},
"Checkmarx": {
href: "https://www.checkmarx.com/"
, title: "Checkmarx project page"
},
"CoverityOnline": {
href: "https://scan.coverity.com"
, title: "Coverity online scanning service"
},
"Wireshark": {
href: "https://www.wireshark.org/"
, title: "Wireshark project page"
},
"tcpdump": {
href: "https://www.tcpdump.org/"
, title: "tcpdump and libpcap project page"
},
"exploit-db": {
href: "https://www.exploit-db.com/"
, title: "Exploit database project page"
},
"WATOBO": {
href: "http://watobo.sourceforge.net/index.html"
, title: "WATOBO. The Web Application Toolbox"
},
"Nikto": {
href: "https://cirt.net/Nikto2"
, title: "Nikto web server scanner"
},
"Yeg11": {
authors: ["S. Yegge"]
, href: "https://plus.google.com/+RipRowan/posts/eVeouesvaVX"
, title: "Stevey's Google Platforms Rant"
, publisher: "Blog"
, date: "Oct. 2011"
},
"Pri19": {
authors: ["M. Pritikin, M. Richardson, T. Eckert,M. Behringer, K. Watsen"]
, href: "https://tools.ietf.org/html/draft-ietf-anima-bootstrapping-keyinfra-26"
, title: "Bootstrapping Remote Secure Key Infrastructures (BRSKI)"
, publisher: "IETF"
, date: "Aug. 2019"
},
"SDO": {
href: "https://www.intel.com/content/dam/www/public/us/en/documents/product-briefs/intel-secure-device-onboard-product-brief.pdf"
, title: "Intel® Secure Device Onboard"
, publisher: "Intel"
, date: "2017"
}
}
};
</script>
</head>
<body>
<section id="abstract">
<p>
This document provides non-normative guidance on Web of Things (WoT) security and privacy.
The Web of Things is descriptive, not prescriptive,
and so is generally designed to support the security models and mechanisms of the systems it describes,
not introduce new ones.
However, a WoT System also has its own unique assets, such as a Scripting API and Thing Descriptions, that
need to be protected and also have security and privacy implications.
</p><p>
We define the general security requirements for a Web of Things (WoT) System using a threat model.
The WoT threat model defines the main security stakeholders, security-relevant assets,
possible attackers, attack surfaces,
and finally threats for a WoT System.
Using this generic WoT threat model for guidance,
it should be possible to select a specific set of security objectives for a concrete WoT System implementation.
We provide several examples using common scenarios based on home, enterprise, and industrial use cases.
We also provide more general suggestions for the design and deployment of a secure WoT System.
All recommendations are linked to the corresponding WoT threats in the generic woT threat model in order to
facilitate understanding of why they are needed.
</p><p>
It is not the intention of this document to limit the set of security mechanisms that can be used to
secure a WoT System.
In particular, while we provide examples and recommendations based on the best available practices in the industry,
this document contains informative statements only.
Specific normative security aspects of the WoT specification are defined in the corresponding normative WoT documents
for each WoT building block.
</p>
<p class="ednote">
This content should be consistent with the summaries in the
Security sections of other WoT documents, in particular the
[[WoT-Architecture]] and [[WoT-Thing-Description]]
documents.
</p>
</section>
<section id="sotd">
<p class="ednote" title="The W3C WoT WG is asking for feedback">
Please contribute to this draft using the <a href="https://github.com/w3c/wot-security/issues">GitHub Issue</a> feature of the <a href="https://github.com/w3c/wot-security/">WoT Security and Privacy Considerations</a> repository.
</p>
</section>
<section>
<h1>Introduction</h1>
<p>Security of a WoT System can refer to the security of the Thing Description (TD) itself or
the security of the Thing the Thing Description describes.
<section>
<h2>Related W3C Documents</h2>
<p>
For a general discussion of best practices for developing secure WoT Systems,
as well as a set of suggested combinations of authentication mechanisms
and secured protocols,
see the <a href="https://github.com/w3c/wot-security-best-practices/">WoT
Security Best Practices</a> document.
</p>
<p>For details on the Web of Things architecture, please refer to the following:
<ul>
<li>the <a href="https://www.w3.org/WoT/IG/">Interest Group</a> web site</li>
<li>the <a href="https://www.w3.org/WoT/WG/">Working Group</a> web site</li>
<li>the [[WoT-Architecture]] document,</li>
<li>the [[WoT-Thing-Description]] document,</li>
<li>the [[WoT-Binding-Templates]] document, and</li>
<li>the [[WoT-Scripting-API]] document.</li>
</ul>
</p>
</section>
</section>
<section id="wot-device-lifecycle">
<h1 id="e-wot-device-lifecycle">Lifecycle of a WoT Device</h1>
<figure id="wot-lifecycle">
<img src="images/WoT_lifecycle_diagram.png"
width="100%"
title="WoT Device Lifecycle"/>
<figcaption>WoT Device Lifecycle</figcaption>
</figure>
<p>The lifecycle of a WoT Device is similar to the lifecycles of other IoT devices and services.
It may in fact be identical if a WoT Thing Description is being used simply to describe an existing device
implemented using another standard.
However,
for discussion purposes we will use the generic lifecycle shown in <a href="#wot-lifecycle"></a>
which includes the following states:
<ul>
<li><strong>Manufactured:</strong> The WoT Device has been manufactured by an OEM.
It might have a WoT runtime present that enables single or multi-tenant users
or it might only have network interfaces exposed present that are compatible with a WoT description.
From the Manufactured state, based on the deployment scenario, the device can transition to either of two states:
the Installation/Commissioning state or the Security Provisioning state.</li>
<li><strong>Installation/Commissioning:</strong> A WoT Device has been installed into its intended deployment environment
by a system provider or system integrator and any necessary SW configuration has been performed.
In practice this state may be combined with or reordered with the Security Provisioning state.</li>
<li><strong>Security Provisioning:</strong> A WoT Device is provisioned with the security metadata and credentials needed
during its Operational state.
The exact set of necessary credentials will vary based on the WoT Device's deployment model and choice of security mechanisms.
The document <cite>The State-of-the-Art and Challenges for the Internet of Things Security</cite> [[Garcia17]]
refers to this stage as "Bootstrapping".</li>
<li><strong>Operational:</strong> The default operational state of WoT Devices.
Devices in this state are fully ready to communicate over WoT interfaces and satisfy their deployment's operational roles.
From the Operational state a device can return to the Manufactured state
if it is fully decommissioned and security de-provisioned
(link E in <a href="#wot-lifecycle"></a>).
It is also possible to perform only a partial reset of a device,
if it only requires re-installation and recommissioning without security re-provisioning
(link D in <a href="#wot-lifecycle"></a>).
It is also possible that only security re-provisioning is needed
without re-installation and re-commissioning (link C in <a href="#wot-lifecycle"></a>).</li>
<li><strong>Maintenance and Security Update:</strong>
A state that is entered when the device's software or configuration needs to be updated.
This is an optional state that can be activated remotely or locally (link A in <a href="#wot-lifecycle"></a>)
on a WoT Device depending on the deployment model and overall setup.
This state can be required to maintain security,
for example to patch SW vulnerabilities or perform security-related configuration updates,
such as key revocation or certificate refresh.
After maintenance or updates are done,
the device normally returns to the Operational state (link B in <a href="#wot-lifecycle"></a>). </li>
</ul>
The scope of this document only covers the Security Provisioning, Operational and Maintenance and Security
Update States of a WoT Device.
</p>
</section>
<section>
<h1>Requirements</h1>
<section>
<h2>General</h2>
<p>
In general using the WoT approach should "do no harm": the security of any protocols should be maintained.
The Web of Things does not introduce new security mechanisms,
but should preserve the functionality and security of existing mechanisms.
We also have the following requirements:
<ul>
<li><strong>Exposing:</strong>
When exposing a TD, especially via the Scripting API,
it should be possible to use best practices for security,
including maintaining the integrity of the TD and delivering it only to authorized recipients.</li>
<li><strong>Consuming:</strong>
A consumed TD should accurately reflect the actual security status of the device it describes.</li>
<li><strong>Protocols:</strong>
The WoT can potentially apply to many protocols but to limit scope in this
discussion we will focus on the needs of HTTP(S), CoAP(S), and MQTT(S).</li>
</ul>
</p>
</section>
<section id="wot-threat-model">
<h2>Threat Model</h2>
<p>
Due to the large diversity of devices, use cases,
deployment scenarios and requirements for WoT Things,
it is impossible to define a single WoT threat model that would fit every case.
Instead we describe here an overall WoT threat model framework that can be adjusted
by OEMs or other WoT System users or providers based on their concrete security requirements.
This framework gives a set of possible threats that implementers should
consider, but which may or may not apply to their WoT System.
</p>
<p>
When selecting suitable mitigations to the WoT threats described, it is important to consider various
criteria that might increase the risk level for a particular WoT architecture, such as handing
privacy-sensitive data, physical safety of individuals or the surrounding environment, high
availability requirements, and so forth.
In addition threat mitigations will always be limited by the capabilities of underlying
devices, their list of supported security protocols, processes isolation capabilities, etc.
</p>
<section id="wot-threat-model-stakeholders">
<h3>WoT Primary Stakeholders</h3>
<p>This section lists the primary WoT stakeholders.</p>
<table>
<tr>
<th>Stakeholder</th>
<th>Description</th>
<th>Security goals</th>
<th>Edge cases</th>
</tr><tr>
<th><dfn data-lt="device manufacturer|device manufacturers|manufacturer|oem">
Device Manufacturer</dfn> (OEM)</th>
<td>
Producer of the HW device.
Implements the WoT runtime on the device,
defines Things that the device provides, and generates TDs for these Things.</td>
<td>
Don't want the devices they make to be used in any form of attack
(due to loss of reputation and possible legal consequences in some countries).
Want to satisfy the security requirements of <a>System users</a>
and <a>System providers</a> to maximize HW sales.</td>
<td></td>
</tr><tr>
<th><dfn data-lt="system provider|system providers">
System Provider</dfn><br/> or
<dfn data-lt="system integrator|system integrators">
System Integrator</dfn><br/> or
<dfn data-lt="system installer|system installers">
System Installer</dfn></th>
<td>
Uses devices from <a>OEM</a>s to build various WoT end solutions
specific to particular WoT use case(s).
An <a>OEM</a> might simultaneously be a System Provider,
although System Providers might also
define new TDs or modify TDs provided by other entities (<a>OEM</a>s).
System Providers
might use the WoT scripting API and runtime to implement their solution
or might do a full reflash of the device to install their own software stack.
A System Provider's scripts and their configuration data might require
confidentiality and/or integrity.
A System Integrator/Installer is similar to a System Provider but tends to
reuse rather than create new technology.
</td>
<td>Don't want their WoT System to be a target of any attacks
(loss of reputation, possible legal consequences in some countries).
Want to satisfy security requirements of System users for better sales.
Don't want security to interfere with usability for better sales
(usability vs. security).
<!-- Is "DOS resistance" a defined term? If so, where are they defined, and do we need links? -->
Want their WoT System to be robust and be resistant to DoS attacks.
Want to hide their proprietary scripts and other relevant data from other parties.
</td>
<td>
There might be several independent system providers (tenants) on a single HW device.
In that case isolation between them is required while (perhaps) sharing
user preferences and identification.
</td>
</tr><tr>
<th><dfn data-lt="system user|system users">System User</dfn></th>
<td>
These might be physical users (e.g. John and his family in their smart home)
or abstract users (e.g. the company running a factory).
The primary characteristic of this stakeholder is the need to use
the WoT System to obtain some functionality.
System Users entrust WoT Systems with their data
(video streams from home cameras or factory plans) or physical capabilities
in the surrounding environment (put lights on in a room or start a machine on the factory line).
They might differ in their access to the WoT System
and transferred data (for example, they might only be able to configure
certain parts of the network or only use it as it is).
</td>
<!-- TODO: Are Data confidentiality and Data integrity defined terms? If so, where are they defined... in requirements? Should they be marked with links? -->
<td>
Don't want their data to be exposed to any other System User,
<a>System Provider</a> or <a>OEM</a> unless intended (Data Confidentiality).
Don't want their data to be modified unless intended (Data Integrity).</td>
<td>Access to user data might be configurable based not only on "who"
is the entity accessing the data (access control subject),
but also his/her/its role,
type of access, or time and context.</td>
</tr><tr>
<th><dfn data-lt="system owner|system owners">System Owner</dfn></th>
<td>
An entity that provisions a Thing with the security root of trust
and sets up the initial policies on who can provision/update/remove scripts
to/from the WoT runtimes, if such model is supported.
Any of the above stakeholders can be the System Owner depending on the
concrete setup.
A WoT System might have a number of independent System Owners,
each with their own set of provisioned certificates and/or credentials.
Underlying IoT protocol suites may also have their own notion of ownership.
</td>
<td>
Want to have a full control over their own provisioned security credentials,
including their integrity and confidentiality.
</td>
<td></td>
</tr><tr>
<th><dfn data-lt="system maintainer|system maintainers">System Maintainer</dfn></th>
<td>
This is an optional stakeholder.
It administers a WoT System on behalf of a <a>System Provider</a>
or <a>System User</a>
</td>
<td>
Needs to have enough access to the WoT System to perform its duties.
Should have minimal (ideally none) access to the data of other stakeholders.
</td>
<td></td>
</tr>
</table>
</section>
<section id="wot-threat-model-assets">
<h3>Assets</h3>
<p>This section lists all WoT Assets that are important from a security point of view.</p>
<table>
<tr>
<th>Asset</th>
<th>Description</th>
<th>Who should have access<br/>(Trust Model)</th>
<th>Attack Points</th>
</tr><tr>
<th><dfn data-lt="thing descriptions|td|tds">
Thing Description</dfn> (TD)</th>
<td>Access Control policies for TDs and the resources it describes are part of TDs.
They are managed using a discretionary access control model
(the owner of a TD sets the AC policy).
Some contents of TDs might be privacy sensitive and therefore should not be shared without a specific need.
The integrity of TDs is crucial for the correct operation of a WoT System.
</td>
<td>TD owner: full access<br/>
Others: read only for minimal required part.</td>
<td>Storage on thing itself, cloud storage, in-transfer (network) including TD updates.</td>
</tr><tr>
<th><dfn data-lt="system user data">System User Data</dfn></th>
<td>This includes all data that is produced or processed by the elements of a WoT System,
i.e. sensor readings and their states, user configurations and preferences, actuator commands,
video/audio streams, etc. Can be highly privacy sensitive and confidential.</td>
<td>Different <a>System Users</a> might have different levels of
access to this data based on the use case. In some cases (like user preferences or settings)
the partial access to this asset is also needed by a <a>System Provider</a>.
Non-authorized access must be minimized since access even to a small amount of information
(for example the last timestamp when a door lock API was used) might have severe
privacy concerns (this example would allow an attacker to detect when the owner is away
from his house).
Security mechanisms should be flexible to configure and might also need to include RBAC.<br/>
Others: should have no access unless specifically allowed</td>
<td>Storage on the device itself, remote solution provider storage (Cloud or other),
in-transfer (network)</td>
</tr><tr>
<th><dfn data-lt="system provider scripts|system provider script">
System Provider Data</dfn>
<td>This includes both WoT scripts and any WoT configuration data produced and owned by a
<a>System Provider</a>. It also includes Exposed Things, i.e.
run-time representations of scripts running inside a WoT Runtime.
<a>System providers</a> might have Intellectual Property (IP) in their scripts,
making them highly confidential.
Protocol Bindings might be part of System Provider Data,
if a WoT Device has a single System Provider that
installs and configures WoT Runtime and Protocol Bindings.
However, these can be also provided and confgured by the OEM,
and the same Protocol Bindings could be used by
multiple System Providers on the same device. </td>
<td><a>System Provider</a>: full access<br/>
Others: no access</td>
<td>Storage on the device itself, runtime memory representation,
in-transfer only for initial provisioning and script updates
</td>
</tr><tr>
<th><dfn data-lt="thing resource">
WoT Thing Resources</dfn><br/> and
<dfn data-lt="wot infrastructure resource">
WoT Infrastructure Resources</dfn></th>
<td>Resources should only be used for legitimate purposes and be available when required.</td>
<td><a>System User</a>, <a>System Provider</a></td>
<!-- TODO: "WoT Interface" is a term for the network API of a Thing
defined in the WoT architecture document. How do we refer to these,
and can we link to their definitions? -->
<td>WoT Interface</td>
</tr><tr>
<th><dfn>WoT Controlled Environment</dfn></th>
<td>WoT Devices that have actuator capabilities are able to affect the physical environment
around them.
Such capability must only be used by authorized entities and for legitimate purposes.
An actuator capability also implies a possible safety risk.</td>
<td><a>System User</a>, <a>System Provider</a> and whoever is explicitly authorized by them to control the environment. </td>
<td>WoT Interface</td>
</tr><tr>
<th><dfn>WoT Behavior Metrics</dfn></th>
<td>Indirectly transmitted information (metadata) that represents measurements of
a WoT System's behavior from which other information can be inferred, such as user presence.
For example, the amount of communication between different things,
the APIs used, distribution of communication over time, etc.</td>
<td>It should not be possible to collect/identify indirectly transferable information</td>
<td>In-transfer data and usage of WoT Interface</td>
</tr><tr>
<th><dfn>WoT Basic Security Metadata</dfn></th>
<td>All required security metadata (keys, certificates etc.) that might be provisioned
to the WoT Device in order to be able to perform various security-related operations,
such as authenticating another device or WoT Consumer in the WoT System,
authenticating remote authorization service in case the access control to WoT interfaces is done using tokens, etc.</td>
<td> Manager Thing (if present in WoT Runtime) - an entity that can implement script lifecycle management operations, WoT Runtime </td>
<td> On device storage, in-transfer including provisioning and updates of security metadata.
</td>
</tr>
</table>
<p>The term <dfn>Thing Data</dfn> can be used to refer to either
<a>System User Data</a> or <a>System Provider Data</a>.</p>
<p>If a WoT System supports dynamic installation of scripts
inside WoT runtime, the following assets are added:</p>
<table>
<tr>
<th>Asset</th>
<th>Description</th>
<th>Who should have access?</br>(Trust Model)</th>
<th>Attack Points</th>
</tr><tr>
<th><dfn>WoT Script Security Metadata</dfn></th>
<td>Defines who can provision, install, update, and remove scripts and other
<a>System Provider Data</a> inside a WoT runtime.</td>
<td><a>System Provider</a>, <a>System Maintainer</a></td>
<td>WoT Script Management Interface</td>
</tr>
</table>
<p>If a WoT System allows co-existence of different independent <a>System Providers</a> (tenants)
on a single physical device, the following assets are added:</p>
<table>
<tr>
<th>Asset</th>
<th>Description</th>
<th>Who should have access?</br>(Trust Model)</th>
<th>Attack Points</th>
</tr><tr>
<th><dfn>WoT Runtime Isolation Policies</dfn></th>
<td>Access control policies for isolating co-existing system providers on the device.
Not required if a simple baseline policy of "full isolation" is applied
to different WoT Runtimes running scripts from different System providers.
It might be required if some level of data sharing between them is needed. </td>
<td><a>System Provider</a>, <a>System Maintainer</a></td>
<td>Storage on the thing itself, remote storage (if they are backed up to a remote storage),
in-transfer for initial provisioning and policy updates</td>
</tr>
</table>
</section>
<section id="wot-threat-adversaries">
<h3>Adversaries</h3>
<p>The following adversaries are in-scope for the WoT threat model: </p>
<table>
<tr>
<th>Persona</th>
<th>Motivation</th>
<th>Attacker type</th>
</tr><tr>
<th><dfn>Network Attacker</dfn></th>
<td>Unauthorized access or modification of any stakeholder's asset over the network.
Denial of service. Inferring of non-public or privacy sensitive information.
Taking control of the network component of a WoT System. Reasons: money, fame etc.</td>
<td>Network attack: an attacker has network access to a WoT System,
is able to use WoT Interface, perform Man-in-the-Middle (MitM) attacks,
drop, delay, reorder, re-play, and inject messages.
This attacker type also includes a passive network attacker, where an attacker is only able to passively
observe the WoT System traffic.</td>
</tr><tr>
<th><dfn data-lt="malicious authorized solution user|malicious authorized solution users|malicious authorized users">
Malicious Authorized User</dfn></th>
<td>Unauthorized access of private data of any other stakeholder (eavesdropping).
Unauthorized modification of data of any stakeholder
(modification of sensor data, or script modification).
Obtaining higher privileges than originally intended by the <a>System Owner</a>
(for example, a hotel guest trying to control overall hotel lighting).</td>
<td>Local physical access, WoT Consumer interface (smartphone, web interface, washing machine interface, etc.)</td>
</tr><tr>
<th><dfn data-lt="malicious unauthorized solution user|malicious unauthorized solution users|malicious unauthorized users">
Malicious Unauthorized User</th>
<td>Similar to <a>Malicious Authorized User</a>,
but with no prior access to the WoT System
(examples: guests in a house, guests in a factory).
Denial of service attacks on WoT System.
</td>
<td>Limited local physical network access, can use proximity factor</td>
</tr><tr>
<th><dfn>Malware Developer</dfn></th>
<td>Unauthorized access or modification of any stakeholder's asset.
Denial of service attacks on WoT System.
Taking control of WoT System network components.
Reasons: money, fame etc.</td>
<td>Unprivileged software adversary:
application intentionally gets installed or code injected into
WoT Consumer (user's smartphone, browser, etc.)
or in WoT runtime itself using available WoT Interfaces</td>
</tr>
</table>
<p>The general term <dfn data-lt="malicious users">Malicious User</dfn> may be used to refer to either a
<a>Malicious Authorized User</a> or a <a>Malicious Unauthorized User</a>.</p>
<p>If a WoT System allows the co-existence of different independent System providers (tenants)
on a single physical device, the following adversaries are added:</p>
<table>
<tr>
<th>Persona</th>
<th>Motivation</th>
<th>Attacker Type</th>
</tr><tr>
<th><dfn>Malicious System Provider</dfn></td>
<td>Tries to get access or modify other <a>System Provider Data</a>,
tries to access or modify <a>System User Data</a> from another solution provider.</td>
<td>Unprivileged software adversary:
<a>System provider scripts</a> running on the same HW device, but inside a different WoT runtime</td>
</tr>
</table>
<p>The following adversaries are out of scope of the WoT threat model:</p>
<table>
<tr>
<th>Persona</th>
<th>Motivation</th>
<th>Attacker Type</th>
</tr><tr>
<th><dfn>Malicious OEM</dfn></th>