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Network Working Group A. Dulaunoy
Internet-Draft A. Iklody
Intended status: Informational CIRCL
Expires: October 12, 2018 April 10, 2018
MISP object template format
draft-dulaunoy-misp-object-template-format
Abstract
This document describes the MISP object template format which
describes a simple JSON format to represent the various templates
used to construct MISP objects. A public directory of common
vocabularies MISP object templates [MISP-O] is available and relies
on the MISP object reference format.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on October 12, 2018.
Copyright Notice
Copyright (c) 2018 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
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the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Conventions and Terminology . . . . . . . . . . . . . . . 2
2. Format . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1.1. Object Template . . . . . . . . . . . . . . . . . . . 3
2.1.2. attributes . . . . . . . . . . . . . . . . . . . . . 4
2.1.3. Sample Object Template object . . . . . . . . . . . . 6
2.1.4. Object Relationships . . . . . . . . . . . . . . . . 9
3. Directory . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 10
5. References . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.1. Normative References . . . . . . . . . . . . . . . . . . 10
5.2. Informative References . . . . . . . . . . . . . . . . . 10
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 11
1. Introduction
Due to the increased maturity of threat information sharing, the need
arose for more complex and exhaustive data-points to be shared across
the various sharing communities. MISP's information sharing in
general relied on a flat structure of attributes contained within an
event, where attributes served as atomic secluded data-points with
some commonalities as defined by the encapsulating event. However,
this flat structure restricted the use of more diverse and complex
data-points described by a list of atomic values, a problem solved by
the MISP object structure.
MISP objects combine a list of attributes to represent a singular
object with various facets. In order to bootstrap the object
creation process and to maintain uniformity among objects describing
similar data-points, the MISP object template format serves as a
reusable and share-able blueprint format.
MISP object templates also include a vocabulary to describe the
various inter object and object to attribute relationships and are
leveraged by MISP object references.
1.1. Conventions and Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119].
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2. Format
MISP object templates are composed of the MISP object template (MUST)
structure itself and a list of MISP object template elements (SHOULD)
describing the list of possible attributes belonging to the resulting
object, along with their context and settings.
MISP object templates themselves consist of a name (MUST), a meta-
category (MUST) and a description (SHOULD). They are identified by a
uuid (MUST) and a version (MUST). The list of requirements when it
comes to the contained MISP object template elements is defined in
the requirements field (OPTIONAL).
MISP object template elements consist of an object_relation (MUST) a
type (MUST) an object_template_id (SHOULD) a ui_priority (SHOULD) a
list of categories (MAY), a list of sane_default values (MAY) or a
values_list (MAY).
2.1. Overview
The MISP object template format uses the JSON [RFC4627] format. Each
template is represented as a JSON object with meta information
including the following fields: uuid, requiredOneOf, description,
version, meta-category, name.
2.1.1. Object Template
2.1.1.1. uuid
uuid represents the Universally Unique IDentifier (UUID) [RFC4122] of
the object template. The uuid MUST be preserved for to keep
consistency of the templates across instances. UUID version 4 is
RECOMMENDED when assigning it to a new object template.
uuid is represented as a JSON string. uuid MUST be present.
2.1.1.2. requiredOneOf
requiredOneOf is represented as a JSON list and contains a list of
attribute relationships of which one must be present in the object to
be created based on the given template. The requiredOneOf field MAY
be present.
2.1.1.3. required
required is represented as a JSON list and contains a list of
attribute relationships of which all must be present in the object to
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be created based on the given template. The required field MAY be
present.
2.1.1.4. description
description is represented as a JSON string and contains the assigned
meaning given to objects created using this template. The
description field MUST be present.
2.1.1.5. version
version represents a numeric incrementing version of the object
template. It is used to associate the object to the correct version
of the template and together with the uuid field forms an association
to the correct template type and version.
version is represented as a JSON string. version MUST be present.
2.1.1.6. meta-category
meta-category represents the sub-category of objects that the given
object template belongs to. meta-categories are not tied to a fixed
list of options but can be created on the fly.
meta-category is represented as a JSON string. meta-category MUST be
present
2.1.1.7. name
name represents the human-readable name of the objects created using
the given template, describing the intent of the object package.
name is represented as a JSON string. name MUST be present
2.1.2. attributes
attributes is represented as a JSON list and contains a list of
template elements used as a template for creating the individual
attributes within the object that is to be created with the object.
attributes is represented as a JSON list. attributes MUST be present.
2.1.2.1. description
description is represented as a JSON string and contains the
description of the given attribute in the context of the object with
the given relationship. The description field MUST be present.
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2.1.2.2. ui-priority
ui-priority is represented by a numeric values in JSON string format
and is meant to provide a priority for the given element in the
object template visualisation. The ui-priority MAY be present.
2.1.2.3. misp-attribute
misp-attribute is represented by a JSON string or a JSON object with
a list of values. The value(s) are taken from the pool of types
defined by the MISP core format's Attribute Object's type list. type
can contain a JSON object with a list of suggested value alternatives
encapsulated in a list within a sane_default key or a list of
enforced value alternatives encapsulated in a list_values key.
The misp-attribute field MUST be present.
2.1.2.4. disable_correlation
disable_correlation is represented by a JSON boolean. The
disable_correlation field flags the attribute(s) created by the given
object template element to be marked as non correlating.
The misp-attribute field MAY be present.
2.1.2.5. categories
categories is represented by a JSON list containing one or several
valid options from the list of verbs valid for the category field in
the Attribute object within the MISP core format.
The categories field MAY be present.
2.1.2.6. multiple
multiple is represented by a JSON boolean value. It marks the MISP
object template element as a multiple input field, allowing for
several attributes to be created by the element within the same
object.
The multiple field MAY be present.
2.1.2.7. sane_default
sane_default is represented by a JSON list containing one or several
recommended/sane values for an attribute. sane_default is mutually
exclusive with values_list.
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The sane_default field MAY be present.
2.1.2.8. values_list
values_list is represented by a JSON List containing one or several
of fixed values for an attribute. values_list is mutually exclusive
with sane_default.
The value_list field MAY be present.
2.1.3. Sample Object Template object
The MISP object template directory is publicly available [MISP-O] in
a git repository and contains more than 60 object templates. As
illustration, two sample objects templates are included.
2.1.3.1. credit-card object template
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{
"requiredOneOf": [
"cc-number"
],
"attributes": {
"version": {
"description": "Version of the card.",
"ui-priority": 0,
"misp-attribute": "text"
},
"comment": {
"description": "A description of the card.",
"ui-priority": 0,
"misp-attribute": "comment"
},
"card-security-code": {
"description": "Card security code (CSC, CVD, CVV, CVC and SPC) as embossed or printed on the card.",
"ui-priority": 0,
"misp-attribute": "text"
},
"name": {
"description": "Name of the card owner.",
"ui-priority": 0,
"misp-attribute": "text"
},
"issued": {
"description": "Initial date of validity or issued date.",
"ui-priority": 0,
"misp-attribute": "datetime"
},
"expiration": {
"description": "Maximum date of validity",
"ui-priority": 0,
"misp-attribute": "datetime"
},
"cc-number": {
"description": "credit-card number as encoded on the card.",
"ui-priority": 0,
"misp-attribute": "cc-number"
}
},
"version": 2,
"description": "A payment card like credit card, debit card or any similar cards which can be used for financial transactions.",
"meta-category": "financial",
"uuid": "2b9c57aa-daba-4330-a738-56f18743b0c7",
"name": "credit-card"
}
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2.1.3.2. credential object template
{
"requiredOneOf": [
"password"
],
"attributes": {
"text": {
"description": "A description of the credential(s)",
"disable_correlation": true,
"ui-priority": 1,
"misp-attribute": "text"
},
"username": {
"description": "Username related to the password(s)",
"ui-priority": 1,
"misp-attribute": "text"
},
"password": {
"description": "Password",
"multiple": true,
"ui-priority": 1,
"misp-attribute": "text"
},
"type": {
"description": "Type of password(s)",
"ui-priority": 1,
"misp-attribute": "text",
"values_list": [
"password",
"api-key",
"encryption-key",
"unknown"
]
},
"origin": {
"description": "Origin of the credential(s)",
"ui-priority": 1,
"misp-attribute": "text",
"sane_default": [
"bruteforce-scanning",
"malware-analysis",
"memory-analysis",
"network-analysis",
"leak",
"unknown"
]
},
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"format": {
"description": "Format of the password(s)",
"ui-priority": 1,
"misp-attribute": "text",
"values_list": [
"clear-text",
"hashed",
"encrypted",
"unknown"
]
},
"notification": {
"description": "Mention of any notification(s) towards the potential owner(s) of the credential(s)",
"ui-priority": 1,
"misp-attribute": "text",
"multiple": true,
"values_list": [
"victim-notified",
"service-notified",
"none"
]
}
},
"version": 2,
"description": "Credential describes one or more credential(s) including password(s), api key(s) or decryption key(s).",
"meta-category": "misc",
"uuid": "a27e98c9-9b0e-414c-8076-d201e039ca09",
"name": "credential"
}
2.1.4. Object Relationships
2.1.4.1. name
name represents the human-readable relationship type which can be
used when creating MISP object relations.
name is represented as a JSON string. name MUST be present.
2.1.4.2. description
description is represented as a JSON string and contains the
description of the object relationship type. The description field
MUST be present.
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2.1.4.3. format
format is represented by a JSON list containing a list of formats
that the relationship type is valid for and can be mapped to. The
format field MUST be present.
3. Directory
The MISP object template directory is publicly available [MISP-O] in
a git repository. The repository contains an objects directory,
which contains a directory per object type, containing a file named
definition.json which contains the definition of the object template
in the above described format.
A relationships directory is also included, containing a
definition.json file which contains a list of MISP object relation
definitions
4. Acknowledgements
The authors wish to thank all the MISP community who are supporting
the creation of open standards in threat intelligence sharing.
5. References
5.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997, <https://www.rfc-
editor.org/info/rfc2119>.
[RFC4122] Leach, P., Mealling, M., and R. Salz, "A Universally
Unique IDentifier (UUID) URN Namespace", RFC 4122,
DOI 10.17487/RFC4122, July 2005, <https://www.rfc-
editor.org/info/rfc4122>.
[RFC4627] Crockford, D., "The application/json Media Type for
JavaScript Object Notation (JSON)", RFC 4627,
DOI 10.17487/RFC4627, July 2006, <https://www.rfc-
editor.org/info/rfc4627>.
5.2. Informative References
[MISP-O] MISP, , "MISP Objects - shared and common object
templates", <https://github.com/MISP/misp-objects>.
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Authors' Addresses
Alexandre Dulaunoy
Computer Incident Response Center Luxembourg
16, bd d'Avranches
Luxembourg L-1611
Luxembourg
Phone: +352 247 88444
Email: alexandre.dulaunoy@circl.lu
Andras Iklody
Computer Incident Response Center Luxembourg
16, bd d'Avranches
Luxembourg L-1611
Luxembourg
Phone: +352 247 88444
Email: andras.iklody@circl.lu
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