7182
PROPOSED STANDARD
Integrity Check Value and Timestamp TLV Definitions for Mobile Ad Hoc Networks (MANETs)
Authors: U. Herberg, T. Clausen, C. Dearlove
Date: April 2014
Area: rtg
Working Group: manet
Stream: IETF
Obsoletes:
RFC 6622
Abstract
This document revises, extends, and replaces RFC 6622. It describes general and flexible TLVs for representing cryptographic Integrity Check Values (ICVs) and timestamps, using the generalized Mobile Ad Hoc Network (MANET) packet/message format defined in RFC 5444. It defines two Packet TLVs, two Message TLVs, and two Address Block TLVs for affixing ICVs and timestamps to a packet, a message, and one or more addresses, respectively.
RFC 7182
PROPOSED STANDARD
Errata Exist
Internet Engineering Task Force (IETF) U. Herberg
Request for Comments: 7182 Fujitsu Laboratories of America
Obsoletes: <a href="./rfc6622">6622</a> T. Clausen
Category: Standards Track LIX, Ecole Polytechnique
ISSN: 2070-1721 C. Dearlove
BAE Systems ATC
April 2014
<span class="h1">Integrity Check Value and Timestamp TLV Definitions</span>
<span class="h1">for Mobile Ad Hoc Networks (MANETs)</span>
Abstract
This document revises, extends, and replaces <a href="./rfc6622">RFC 6622</a>. It describes
general and flexible TLVs for representing cryptographic Integrity
Check Values (ICVs) and timestamps, using the generalized Mobile Ad
Hoc Network (MANET) packet/message format defined in <a href="./rfc5444">RFC 5444</a>. It
defines two Packet TLVs, two Message TLVs, and two Address Block TLVs
for affixing ICVs and timestamps to a packet, a message, and one or
more addresses, respectively.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in <a href="./rfc5741#section-2">Section 2 of RFC 5741</a>.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
<a href="https://www.rfc-editor.org/info/rfc7182">http://www.rfc-editor.org/info/rfc7182</a>.
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Copyright Notice
Copyright (c) 2014 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to <a href="https://www.rfc-editor.org/bcp/bcp78">BCP 78</a> and the IETF Trust's Legal
Provisions Relating to IETF Documents
(<a href="http://trustee.ietf.org/license-info">http://trustee.ietf.org/license-info</a>) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
<a href="#section-1">1</a>. Introduction ....................................................<a href="#page-3">3</a>
<a href="#section-1.1">1.1</a>. Differences from <a href="./rfc6622">RFC 6622</a> ..................................<a href="#page-4">4</a>
<a href="#section-2">2</a>. Terminology .....................................................<a href="#page-4">4</a>
<a href="#section-3">3</a>. Applicability Statement .........................................<a href="#page-5">5</a>
<a href="#section-4">4</a>. Security Architecture ...........................................<a href="#page-6">6</a>
<a href="#section-5">5</a>. Overview and Functioning ........................................<a href="#page-7">7</a>
<a href="#section-6">6</a>. General ICV TLV Structure .......................................<a href="#page-8">8</a>
<a href="#section-7">7</a>. General Timestamp TLV Structure .................................<a href="#page-8">8</a>
<a href="#section-8">8</a>. Packet TLVs .....................................................<a href="#page-9">9</a>
<a href="#section-8.1">8.1</a>. ICV Packet TLV .............................................<a href="#page-9">9</a>
<a href="#section-8.2">8.2</a>. TIMESTAMP Packet TLV ......................................<a href="#page-10">10</a>
<a href="#section-9">9</a>. Message TLVs ...................................................<a href="#page-10">10</a>
<a href="#section-9.1">9.1</a>. ICV Message TLV ...........................................<a href="#page-10">10</a>
<a href="#section-9.2">9.2</a>. TIMESTAMP Message TLV .....................................<a href="#page-10">10</a>
<a href="#section-10">10</a>. Address Block TLVs ............................................<a href="#page-11">11</a>
<a href="#section-10.1">10.1</a>. ICV Address Block TLV ....................................<a href="#page-11">11</a>
<a href="#section-10.2">10.2</a>. TIMESTAMP Address Block TLV ..............................<a href="#page-11">11</a>
<a href="#section-11">11</a>. ICV: Basic ....................................................<a href="#page-11">11</a>
<a href="#section-12">12</a>. ICV: Hash Function and Cryptographic Function .................<a href="#page-12">12</a>
<a href="#section-12.1">12.1</a>. General ICV TLV Structure ................................<a href="#page-12">12</a>
<a href="#section-12.1.1">12.1.1</a>. Rationale .........................................<a href="#page-14">14</a>
<a href="#section-12.1.2">12.1.2</a>. Parameters ........................................<a href="#page-15">15</a>
<a href="#section-12.2">12.2</a>. Considerations for Calculating the ICV ...................<a href="#page-15">15</a>
<a href="#section-12.2.1">12.2.1</a>. ICV Packet TLV ....................................<a href="#page-15">15</a>
<a href="#section-12.2.2">12.2.2</a>. ICV Message TLV ...................................<a href="#page-16">16</a>
<a href="#section-12.2.3">12.2.3</a>. ICV Address Block TLV .............................<a href="#page-16">16</a>
<a href="#section-12.3">12.3</a>. Example of a Message Including an ICV ....................<a href="#page-17">17</a>
<a href="#section-13">13</a>. IANA Considerations ...........................................<a href="#page-19">19</a>
<a href="#section-13.1">13.1</a>. Expert Review: Evaluation Guidelines .....................<a href="#page-19">19</a>
<a href="#section-13.2">13.2</a>. Packet TLV Types .........................................<a href="#page-20">20</a>
<a href="#section-13.3">13.3</a>. Message TLV Types ........................................<a href="#page-20">20</a>
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<a href="#section-13.4">13.4</a>. Address Block TLV Types ..................................<a href="#page-20">20</a>
<a href="#section-13.5">13.5</a>. ICV Packet TLV Type Extensions ...........................<a href="#page-21">21</a>
<a href="#section-13.6">13.6</a>. TIMESTAMP Packet TLV Type Extensions .....................<a href="#page-21">21</a>
<a href="#section-13.7">13.7</a>. ICV Message TLV Type Extensions ..........................<a href="#page-22">22</a>
<a href="#section-13.8">13.8</a>. TIMESTAMP Message TLV Type Extensions ....................<a href="#page-23">23</a>
<a href="#section-13.9">13.9</a>. ICV Address Block TLV Type Extensions ....................<a href="#page-24">24</a>
<a href="#section-13.10">13.10</a>. TIMESTAMP Address Block TLV Type Extensions .............<a href="#page-25">25</a>
<a href="#section-13.11">13.11</a>. Hash Functions ..........................................<a href="#page-26">26</a>
<a href="#section-13.12">13.12</a>. Cryptographic Functions .................................<a href="#page-27">27</a>
<a href="#section-14">14</a>. Security Considerations .......................................<a href="#page-28">28</a>
<a href="#section-15">15</a>. Acknowledgements ..............................................<a href="#page-28">28</a>
<a href="#section-16">16</a>. References ....................................................<a href="#page-29">29</a>
<a href="#section-16.1">16.1</a>. Normative References .....................................<a href="#page-29">29</a>
<a href="#section-16.2">16.2</a>. Informative References ...................................<a href="#page-30">30</a>
<span class="h2"><a class="selflink" id="section-1" href="#section-1">1</a>. Introduction</span>
This document specifies a syntactical representation of security-
related information for use with [<a href="./rfc5444" title=""Generalized Mobile Ad Hoc Network (MANET) Packet/Message Format"">RFC5444</a>] addresses, messages, and
packets. It also specifies IANA registrations of TLV types and type
extension registries for these TLV types. This specification does
not represent a stand-alone protocol, but it is intended for use by
MANET routing protocols or security extensions thereof.
Specifically, this document, which revises, extends, and replaces
[<a href="./rfc6622" title=""Integrity Check Value and Timestamp TLV Definitions for Mobile Ad Hoc Networks (MANETs)"">RFC6622</a>], specifies:
o Two kinds of TLV: one for carrying Integrity Check Values (ICVs)
and one for timestamps in packets, messages, and Address Blocks as
defined by [<a href="./rfc5444" title=""Generalized Mobile Ad Hoc Network (MANET) Packet/Message Format"">RFC5444</a>].
o A generic framework for use of these TLVs, accounting for specific
features of Packet, Message, and Address Block TLVs.
o IANA registrations for TLVs, and registries for TLV type
extensions, replacing those from [<a href="./rfc6622" title=""Integrity Check Value and Timestamp TLV Definitions for Mobile Ad Hoc Networks (MANETs)"">RFC6622</a>].
This document specifies IANA registries for recording code points for
ICV TLVs and TIMESTAMP TLVs, as well as timestamps, hash functions,
and cryptographic functions.
Moreover, in <a href="#section-12">Section 12</a>, this document defines the following:
o A method for generating ICVs using a combination of a
cryptographic function and a hash function and for including such
ICVs in the value field of a TLV.
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<span class="h3"><a class="selflink" id="section-1.1" href="#section-1.1">1.1</a>. Differences from <a href="./rfc6622">RFC 6622</a></span>
This document obsoletes [<a href="./rfc6622" title=""Integrity Check Value and Timestamp TLV Definitions for Mobile Ad Hoc Networks (MANETs)"">RFC6622</a>], replacing that document as the
specification of two TLV types, TIMESTAMP and ICV, for packets,
messages and Address Blocks. For the ICV type, this document
specifies a new type extension, 2 (see <a href="#section-12">Section 12</a>), in addition to
including the original type extensions (0 and 1) from [<a href="./rfc6622" title=""Integrity Check Value and Timestamp TLV Definitions for Mobile Ad Hoc Networks (MANETs)"">RFC6622</a>].
The TLV value of an ICV TLV with type extension = 2 has the same
internal structure as an ICV TLV with type extension = 1 but is
calculated also over the source address of the IP datagram carrying
the packet, message, or Address Block. The rationale for adding this
type extension is that some MANET protocols, such as [<a href="./rfc6130" title=""Mobile Ad Hoc Network (MANET) Neighborhood Discovery Protocol (NHDP)"">RFC6130</a>], use
the IP source address of the IP datagram carrying the packet,
message, or Address Block, e.g., to identify links with neighbor
routers. If this address is not otherwise contained in the packet,
message, or Address Block payload (which is permitted, e.g., in
[<a href="./rfc6130" title=""Mobile Ad Hoc Network (MANET) Neighborhood Discovery Protocol (NHDP)"">RFC6130</a>]), then the address is not protected against tampering.
This document also incorporates a number of editorial improvements
over [<a href="./rfc6622" title=""Integrity Check Value and Timestamp TLV Definitions for Mobile Ad Hoc Networks (MANETs)"">RFC6622</a>]. In particular, it makes it clear that an ICV TLV may
be used to carry a truncated ICV and that a single or multivalue
TIMESTAMP or ICV Address Block TLV may cover more than one address.
Moreover, to be consistent with the terminology in [<a href="./rfc5444" title=""Generalized Mobile Ad Hoc Network (MANET) Packet/Message Format"">RFC5444</a>], the
name of the TLVs specified in this document have changed from "Packet
ICV TLV" to "ICV Packet TLV" and from "Packet TIMESTAMP TLV" to
"TIMESTAMP Packet TLV" (and similar for Message and Address Block
TLVs).
A normative requirement in <a href="#section-9.2">Section 9.2</a> has changed from SHOULD to
MUST in the following sentence:
If a message contains one or more TIMESTAMP TLVs and one or more
ICV TLVs, then the TIMESTAMP TLVs (as well as any other Message
TLVs) MUST be added to the message before the ICV TLVs....
<span class="h2"><a class="selflink" id="section-2" href="#section-2">2</a>. Terminology</span>
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" title=""Key words for use in RFCs to Indicate Requirement Levels"">RFC2119</a>].
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This document uses the terminology and notation defined in [<a href="./rfc5444" title=""Generalized Mobile Ad Hoc Network (MANET) Packet/Message Format"">RFC5444</a>].
In particular, the following TLV fields and notation from [<a href="./rfc5444" title=""Generalized Mobile Ad Hoc Network (MANET) Packet/Message Format"">RFC5444</a>]
are used in this specification:
<msg-hop-limit> is the hop limit of a message, as specified in
<a href="./rfc5444#section-5.2">Section 5.2 of [RFC5444]</a>.
<msg-hop-count> is the hop count of a message, as specified in
<a href="./rfc5444#section-5.2">Section 5.2 of [RFC5444]</a>.
<length> is the length of the value field in a TLV in octets, as
specified in <a href="./rfc5444#section-5.4.1">Section 5.4.1 of [RFC5444]</a>.
single-length is the length of a single value in the value field in
a TLV in octets, as specified in <a href="./rfc5444#section-5.4.1">Section 5.4.1 of [RFC5444]</a>. (It
is equal to <length> except in a multivalue Address Block TLV.)
In addition to using the regular expressions defined in <a href="./rfc5444#section-2.1.1">Section 2.1.1
of [RFC5444]</a>, this document defines the following:
+ - One or more occurrences of the preceding element or group.
<span class="h2"><a class="selflink" id="section-3" href="#section-3">3</a>. Applicability Statement</span>
MANET routing protocols using the format defined in [<a href="./rfc5444" title=""Generalized Mobile Ad Hoc Network (MANET) Packet/Message Format"">RFC5444</a>] are
accorded the ability to carry additional information in control
messages and packets through the inclusion of TLVs. Information so
included MAY be used by a MANET routing protocol, or by an extension
of a MANET routing protocol, according to its specification.
This document specifies how to include an ICV for a packet, a
message, and addresses in an Address Block within a message, using
such TLVs. This document also specifies how to treat an empty Packet
TLV Block, and "mutable" fields, specifically the <msg-hop-count> and
<msg-hop-limit> fields, if present in the Message Header when
calculating ICVs, such that the resulting ICV can be correctly
verified by any recipient.
This document describes a generic framework for creating ICVs, and
how to include these ICVs in TLVs. In <a href="#section-12">Section 12</a>, an example method
for calculating such ICVs is given, using a cryptographic function
and a hash function, for which two TLV type extensions are allocated.
This document does not specify a protocol. Protocol specifications
that make use of the framework, specified in this document, will
reference this document in a normative way, and they may require the
implementation of some or all of the algorithms described in this
document. As this document does not specify a protocol itself, key
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management and key exchange mechanisms are out of scope and may be
specified in the protocol or protocol extension using this
specification.
<span class="h2"><a class="selflink" id="section-4" href="#section-4">4</a>. Security Architecture</span>
MANET routing protocol specifications may have a clause allowing a
control message to be rejected as "badly formed" or "insecure" prior
to the message being processed or forwarded. In particular, MANET
routing protocols such as the Neighborhood Discovery Protocol (NHDP)
[<a href="./rfc6130" title=""Mobile Ad Hoc Network (MANET) Neighborhood Discovery Protocol (NHDP)"">RFC6130</a>] and the Optimized Link State Routing Protocol version 2
[<a href="./rfc7181" title=""The Optimized Link State Routing Protocol Version 2"">RFC7181</a>] recognize external reasons (such as failure to verify an
ICV) for rejecting a message that would be considered "invalid for
processing".
This architecture is a result of the observation that with respect to
security in MANETs, "one size rarely fits all" and that MANET routing
protocol deployment domains have varying security requirements
ranging from "unbreakable" to "virtually none". The virtue of this
approach is that MANET routing protocol specifications (and
implementations) can remain "generic", with extensions providing
proper security mechanisms specific to a deployment domain.
The MANET routing protocol "security architecture", in which this
specification situates itself, can therefore be summarized as
follows:
o MANET routing protocol specifications, each with a clause allowing
an extension to reject a message (prior to processing/forwarding)
as "badly formed" or "insecure".
o MANET routing protocol security extensions, each rejecting
messages as "badly formed" or "insecure", as appropriate for a
given security requirement specific to a deployment domain.
o Code points and an exchange format for information, necessary for
specification of such MANET routing protocol security extensions.
This document addresses the last of the points above, by specifying a
common exchange format for cryptographic ICVs and timestamps, making
reservations from within the Packet TLV, Message TLV, and Address
Block TLV registries of [<a href="./rfc5444" title=""Generalized Mobile Ad Hoc Network (MANET) Packet/Message Format"">RFC5444</a>], to be used by (and shared among)
MANET routing protocol security extensions.
For the specific decomposition of an ICV using a cryptographic
function and a hash function (specified in <a href="#section-12">Section 12</a>), this document
specifies two IANA registries (see <a href="#section-13">Section 13</a>) for code points for
hash functions and cryptographic functions.
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With respect to [<a href="./rfc5444" title=""Generalized Mobile Ad Hoc Network (MANET) Packet/Message Format"">RFC5444</a>], this document is:
o Intended to be used in the non-normative, but intended, mode of
use described in <a href="./rfc5444#appendix-B">Appendix B of [RFC5444]</a>.
o A specific example of the Security Considerations section of
[<a href="./rfc5444" title=""Generalized Mobile Ad Hoc Network (MANET) Packet/Message Format"">RFC5444</a>] (the authentication part).
<span class="h2"><a class="selflink" id="section-5" href="#section-5">5</a>. Overview and Functioning</span>
This document specifies a syntactical representation of security-
related information for use with [<a href="./rfc5444" title=""Generalized Mobile Ad Hoc Network (MANET) Packet/Message Format"">RFC5444</a>] addresses, messages, and
packets, and also specifies IANA registrations (see <a href="#section-13">Section 13</a>) of
TLV types and type extension registries for these TLV types.
Moreover, this document provides guidelines for how MANET routing
protocols, and MANET routing protocol extensions using this
specification, should treat ICV and Timestamp TLVs, and mutable
fields in messages. This specification does not represent a stand-
alone protocol. MANET routing protocols, and MANET routing protocol
extensions using this specification, MUST provide instructions as to
how to handle packets, messages, and addresses with security
information, associated as specified in this document.
This document specifies TLV type assignments (see <a href="#section-13">Section 13</a>) from
the registries defined for Packet, Message, and Address Block TLVs in
[<a href="./rfc5444" title=""Generalized Mobile Ad Hoc Network (MANET) Packet/Message Format"">RFC5444</a>]. When a TLV type is assigned from one of these registries,
a registry for type extensions for that TLV type is created by IANA.
This document specifies these type extension registries, in order to
specify internal structure (and accompanying processing) of the
<value> field of a TLV.
For example, and as specified in this document, an ICV TLV with type
extension = 0 specifies that the <value> field has no predefined
internal structure, but is simply a sequence of octets. An ICV TLV
with type extension = 1 specifies that the <value> field has a
predefined internal structure and defines its interpretation. An ICV
TLV with type extension = 2 (added in this document) is the same as
an ICV TLV with type extension = 1, except that the integrity
protection also covers the source address of the IP datagram carrying
the packet, message, or Address Block.
Specifically, with type extension = 1 or type extension = 2, the
<value> field contains the result of combining a cryptographic
function and a hash function, calculated over the contents of the
packet, message, or Address Block. The <value> field contains sub-
fields indicating which hash function and cryptographic function have
been used, as specified in <a href="#section-12">Section 12</a>.
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Other documents can request assignments for other type extensions; if
they do so, they MUST specify their internal structure (if any) and
interpretation.
<span class="h2"><a class="selflink" id="section-6" href="#section-6">6</a>. General ICV TLV Structure</span>
The value of the ICV TLV is:
<value> := <ICV-value>+
where:
<ICV-value> is a field, of length <length> octets (except in a
multivalue Address Block TLV, where each <ICV-value> is of length
single-length octets) that contains the information to be
interpreted by the ICV verification process, as specified by the
type extension.
Note that this does not specify how to calculate the <ICV-value> nor
the internal structure thereof, if any; such information MUST be
specified by the type extension for the ICV TLV type; see <a href="#section-13">Section 13</a>.
This document specifies three such type extensions: one for ICVs
without predefined structures and two for ICVs constructed combining
a cryptographic function and a hash function.
<span class="h2"><a class="selflink" id="section-7" href="#section-7">7</a>. General Timestamp TLV Structure</span>
The value of the Timestamp TLV is:
<value> := <time-value>+
where:
<time-value> is a field, of length <length> octets (except in a
multivalue Address Block TLV, where each <time-value> is of length
single-length octets) that contains the timestamp.
Note that this does not specify how to calculate the <time-value> nor
the internal structure thereof, if any; such information MUST be
specified by the type extension for the TIMESTAMP TLV type; see
<a href="#section-13">Section 13</a>.
A timestamp is essentially "freshness information". As such, its
setting and interpretation are to be determined by the MANET routing
protocol, or MANET routing protocol extension, that uses the
timestamp and can, for example, correspond to a POSIX timestamp, GPS
timestamp, or a simple sequence number. Note that ensuring time
synchronization in a MANET may be difficult because of the
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decentralized architecture as well as highly dynamic topology due to
mobility or other factors. It is out of scope for this document to
specify a time synchronization mechanism.
<span class="h2"><a class="selflink" id="section-8" href="#section-8">8</a>. Packet TLVs</span>
Two Packet TLVs are defined: one for including the cryptographic ICV
of a packet and one for including the timestamp indicating the time
at which the cryptographic ICV was calculated.
<span class="h3"><a class="selflink" id="section-8.1" href="#section-8.1">8.1</a>. ICV Packet TLV</span>
An ICV Packet TLV is an example of an ICV TLV as described in
<a href="#section-6">Section 6</a>. When determining the <ICV-value> for a packet, and adding
an ICV Packet TLV to a packet, the following considerations MUST be
applied:
o Because packets as defined in [<a href="./rfc5444" title=""Generalized Mobile Ad Hoc Network (MANET) Packet/Message Format"">RFC5444</a>] are never forwarded by
routers, no special considerations are required regarding mutable
fields (i.e., <msg-hop-count> and <msg-hop-limit>), if present
within any messages in the packet, when calculating the ICV.
o Any ICV Packet TLVs already present in the Packet TLV Block MUST
be removed before calculating the ICV, and the Packet TLV Block
size MUST be recalculated accordingly.
o If the Packet TLV Block now contains no Packet TLVs, the Packet
TLV Block MUST be removed, and the phastlv bit in the <pkt-flags>
field in the Packet Header MUST be cleared ('0').
o Any removed ICV Packet TLVs MUST be restored after having
calculated the ICV, and the Packet TLV Block size MUST be
recalculated accordingly.
o When any removed ICV Packet TLVs, and the newly calculated ICV
Packet TLV, are added to the packet, if there is no Packet TLV
Block, then one MUST be added, including setting ('1') the phastlv
bit in the <pkt-flags> field in the Packet Header.
The rationale for removing any ICV Packet TLVs already present prior
to calculating the ICV is that several ICV TLVs may be added to the
same packet, e.g., using different ICV cryptographic and/or hash
functions. The rationale for removing an empty Packet TLV Block is
because the receiver of the packet cannot tell the difference between
what was an absent Packet TLV Block, and what was an empty Packet TLV
Block when removing and verifying the ICV Packet TLV if no other
Packet TLVs are present.
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<span class="h3"><a class="selflink" id="section-8.2" href="#section-8.2">8.2</a>. TIMESTAMP Packet TLV</span>
A TIMESTAMP Packet TLV is an example of a Timestamp TLV as described
in <a href="#section-7">Section 7</a>. If a packet contains one or more TIMESTAMP TLVs and
one or more ICV TLVs, then the TIMESTAMP TLVs (as well as any other
Packet TLVs) MUST be added to the packet before the ICV TLVs, in
order to include the timestamps and other TLVs in the calculation of
the ICVs.
<span class="h2"><a class="selflink" id="section-9" href="#section-9">9</a>. Message TLVs</span>
Two Message TLVs are defined: one for including the cryptographic ICV
of a message and one for including the timestamp indicating the time
at which the cryptographic ICV was calculated.
<span class="h3"><a class="selflink" id="section-9.1" href="#section-9.1">9.1</a>. ICV Message TLV</span>
An ICV Message TLV is an example of an ICV TLV as described in
<a href="#section-6">Section 6</a>. When determining the <ICV-value> for a message, the
following considerations MUST be applied:
o The fields <msg-hop-limit> and <msg-hop-count>, if present in the
Message Header, MUST both be assumed to have the value 0 (zero)
when calculating the ICV.
o Any ICV Message TLVs already present in the Message TLV Block MUST
be removed before calculating the ICV, and the message size as
well as the Message TLV Block size MUST be recalculated
accordingly. Also, all relevant TLVs other than ICV TLVs MUST be
added prior to ICV value calculation.
o Any removed ICV Message TLVs MUST be restored after having
calculated the ICV, and the message size as well as the Message
TLV Block size MUST be recalculated accordingly.
The rationale for removing any ICV Message TLVs already present prior
to calculating the ICV is that several ICV TLVs may be added to the
same message, e.g., using different ICV cryptographic and/or hash
functions.
<span class="h3"><a class="selflink" id="section-9.2" href="#section-9.2">9.2</a>. TIMESTAMP Message TLV</span>
A TIMESTAMP Message TLV is an example of a Timestamp TLV as described
in <a href="#section-7">Section 7</a>. If a message contains one or more TIMESTAMP TLVs and
one or more ICV TLVs, then the TIMESTAMP TLVs (as well as any other
Message TLVs) MUST be added to the message before the ICV TLVs, in
order to include the timestamps and other Message TLVs in the
calculation of the ICV.
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<span class="h2"><a class="selflink" id="section-10" href="#section-10">10</a>. Address Block TLVs</span>
Two Address Block TLVs are defined: one for associating a
cryptographic ICV to one or more addresses and their associated
information and one for including the timestamp indicating the time
at which the cryptographic ICV was calculated.
<span class="h3"><a class="selflink" id="section-10.1" href="#section-10.1">10.1</a>. ICV Address Block TLV</span>
An ICV Address Block TLV is an example of an ICV TLV as described in
<a href="#section-6">Section 6</a>. The ICV is calculated over one or more addresses,
concatenated with any other values -- for example, other Address
Block TLV <value> fields -- associated with those addresses. A MANET
routing protocol, or MANET routing protocol extension, using ICV
Address Block TLVs MUST specify how to include any such concatenated
attributes of the addresses in the calculation and verification
processes for the ICV. When determining an <ICV-value> for one or
more addresses, the following consideration MUST be applied:
o If other TLV values are concatenated with the addresses for
calculating the ICV, the corresponding TLVs MUST NOT be ICV
Address Block TLVs already associated with any of the addresses.
The rationale for not concatenating the addresses with any ICV TLV
values already associated with the addresses when calculating the ICV
is that several ICVs may be added to the same address or addresses,
e.g., using different ICV cryptographic and/or hash functions, and
the order of addition is not known to the recipient.
<span class="h3"><a class="selflink" id="section-10.2" href="#section-10.2">10.2</a>. TIMESTAMP Address Block TLV</span>
A TIMESTAMP Address Block TLV is an example of a Timestamp TLV as
described in <a href="#section-7">Section 7</a>. If one or more TIMESTAMP TLVs and one or
more ICV TLVs are associated with an address, the relevant TIMESTAMP
TLV <time-value>(s) MUST be included before calculating the value of
the ICV to be contained in the ICV TLV value (i.e., concatenated with
the associated addresses and any other values as described in
<a href="#section-10.1">Section 10.1</a>).
<span class="h2"><a class="selflink" id="section-11" href="#section-11">11</a>. ICV: Basic</span>
The basic ICV, represented by way of an ICV TLV with type
extension = 0, has as TLV value a simple bit-field without specified
structure (i.e, without explicitly included hash function, crypto
function, key ID or other parameters). Moreover, it is not specified
how to calculate the <ICV-value>. It is assumed that the mechanism
specifying how ICVs are calculated and verified, as well as which
parameters (if any) need to be exchanged prior to using the TLV with
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type extension = 0, is established outside of this specification,
e.g., by administrative configuration or external out-of-band
signaling.
The <ICV-value>, when using type extension = 0, is:
<ICV-value> := <ICV-data>
where:
<ICV-data> is a field, of length <length> octets (or single-length
octets in a multivalue Address Block TLV) that contains the
cryptographic ICV.
<span class="h2"><a class="selflink" id="section-12" href="#section-12">12</a>. ICV: Hash Function and Cryptographic Function</span>
One common way of calculating an ICV is combining a cryptographic
function and a hash function applied to the content. This
decomposition is specified in this section, using either type
extension = 1 or type extension = 2, in the ICV TLVs.
<span class="h3"><a class="selflink" id="section-12.1" href="#section-12.1">12.1</a>. General ICV TLV Structure</span>
The following data structure allows representation of a cryptographic
ICV, including specification of the appropriate hash function and
cryptographic function used for calculating the ICV:
<ICV-value> := <hash-function>
<cryptographic-function>
<key-id-length>
<key-id>?
<ICV-data>
where:
<hash-function> is a one-octet unsigned integer field specifying
the hash function.
<cryptographic-function> is a one-octet unsigned integer field
specifying the cryptographic function.
<key-id-length> is a one-octet unsigned integer field specifying
the length of the <key-id> field as a number of octets. The value
zero (0x00) is reserved for using a single pre-installed, shared
key.
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<key-id> is a field specifying the key identifier of the key that
was used to calculate the ICV of the message, which allows unique
identification of different keys with the same originator. It is
the responsibility of each key originator to make sure that
actively used keys that it issues have distinct key identifiers.
If <key-id-length> equals zero (0x00), the <key-id> field is not
contained in the TLV, and a single pre-installed, shared key is
used.
<ICV-data> is a field with length <length> - 3 - <key-id-length>
octets (except in a multivalue Address Block TLV, in which it is
single-length - 3 - <key-id-length> octets) and that contains the
cryptographic ICV.
The version of this TLV, specified in this section, assumes that,
unless otherwise specified, calculating the ICV can be decomposed
into:
ICV-value = cryptographic-function(hash-function(content))
In some cases, a different combination of cryptographic function and
hash function may be specified. This is the case for the Hashed
Message Authentication Code (HMAC) function, which is specified as
defined in <a href="#section-13.12">Section 13.12</a>, using the hash function twice. Using
cryptographic-function "none" is provided for symmetry and possible
future use, but it SHOULD NOT be used with any currently specified
hash function.
The difference between the two type extensions is that in addition to
the information covered by the ICV using type extension = 1 (which is
detailed in the following sections), the ICV using type extension = 2
also MUST cover the source address of the IP datagram carrying the
corresponding packet, message, or Address Block.
The <ICV-data> field MAY be truncated after being calculated, this is
indicated by its length, calculated as described above. The
truncation MUST be as specified for the relevant cryptographic
function (and, if appropriate, hash function).
o When using truncation, the guidelines for minimal ICV length set
out in [<a href="#ref-NIST-SP-800-107">NIST-SP-800-107</a>] MUST be followed. In particular the
<ICV-data> field when using HMAC MUST NOT be truncated below 4
octets.
o The truncated ICV length MUST be so large that the probability of
success of a dictionary attack is acceptably small. Such a
success will arise if the ICV of a spoofed packet or message is
verified. The probability of success is a function of (a) how
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many routers can be attacked, (b) how fast a router can receive
packets or messages and attempt to verify their ICV, (c) the
truncated ICV length, and (d) the lifetime of the network. If the
truncated ICV length in bits is L, then 2^L packets or messages
are required to attack with certainty of success. With a
verification rate of R packets/messages per second, applied to N
routers over an available time of T, the probability of success is
given by NRT/2^L. If this is not to exceed a probability of P,
then L > log2(NRT/P). For example, if N is 32, R is 1000, T is
86400 (I day) and P is 10^-6, then L must be at least 52 bits.
Some of the cryptographic and hash functions listed in <a href="#section-13">Section 13</a>
require the length of the content to be digitally signed to be a
multiple of a certain number of octets. As a consequence, they
specify padding mechanisms, e.g., AES-CMAC [<a href="./rfc4493" title=""The AES-CMAC Algorithm"">RFC4493</a>] specifies a
padding mechanism for message lengths that are not equal to a
multiple of 16 octets. Implementations of the framework in this
document MUST support appropriate padding mechanisms, as specified in
the cryptographic or hash function specifications.
The hash function and the cryptographic function correspond to the
entries in two IANA registries, which are described in <a href="#section-13">Section 13</a>.
<span class="h4"><a class="selflink" id="section-12.1.1" href="#section-12.1.1">12.1.1</a>. Rationale</span>
The rationale for separating the hash function and the cryptographic
function into two octets instead of having all combinations in a
single octet -- possibly as a TLV type extension -- is that adding
further hash functions or cryptographic functions in the future may
lead to a non-contiguous number space as well as a smaller overall
space.
The rationale for not including a field that lists parameters of the
cryptographic ICV in the TLV is that, before being able to validate a
cryptographic ICV, routers have to exchange or acquire keys. Any
additional parameters can be provided together with the keys in that
bootstrap process. Therefore, it is not necessary, and would even
entail an extra overhead, to transmit the parameters within every
message.
The rationale for the addition of type extension = 2 is that the
source address is used in some cases, such as when processing HELLO
messages in [<a href="./rfc6130" title=""Mobile Ad Hoc Network (MANET) Neighborhood Discovery Protocol (NHDP)"">RFC6130</a>]. This is applicable only to packets (which
only ever travel one hop) and messages (and their Address Blocks)
that only travel one hop. It is not applicable to messages that may
be forwarded more than one hop, such as Topology Control (TC)
messages in [<a href="./rfc7181" title=""The Optimized Link State Routing Protocol Version 2"">RFC7181</a>].
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<span class="h4"><a class="selflink" id="section-12.1.2" href="#section-12.1.2">12.1.2</a>. Parameters</span>
As described in <a href="#section-12.1.1">Section 12.1.1</a>, parameters are selected
administratively on each router before using this framework in a
MANET, in addition to exchanging the keys between MANET routers.
This was a design decision in [<a href="./rfc6622" title=""Integrity Check Value and Timestamp TLV Definitions for Mobile Ad Hoc Networks (MANETs)"">RFC6622</a>] and is kept in this
specification for reasons of backwards compatibility.
The following parameters are RECOMMENDED and SHOULD be those chosen
administratively, unless there are good reasons otherwise:
o For crypto function RSA:
* Signature scheme: RSASSA-PSS with the default parameters:
rSASSA-PSS-Default-Identifier (as defined in [<a href="./rfc3447" title=""Public-Key Cryptography Standards (PKCS) #1: RSA Cryptography Specifications Version 2.1"">RFC3447</a>])
* Common exponent: 65537
o For crypto function ECDSA:
* Curve name: exchanged as part of key distribution
* Hash function: The hash function MUST be pinned to the curve,
i.e., use SHA-256 for the p-256 curve, SHA-384 for p-384, etc.
o For crypto function AES:
* Authentication algorithm: Cipher-Based Message Authentication
Code (CMAC) (as defined in [<a href="./rfc4493" title=""The AES-CMAC Algorithm"">RFC4493</a>])
* Hash function: None
<span class="h3"><a class="selflink" id="section-12.2" href="#section-12.2">12.2</a>. Considerations for Calculating the ICV</span>
The considerations listed in the following subsections MUST be
applied when calculating the ICV for Packet, Message, and Address
Block TLVs, respectively.
<span class="h4"><a class="selflink" id="section-12.2.1" href="#section-12.2.1">12.2.1</a>. ICV Packet TLV</span>
When determining the <ICV-data> for a packet, with type
extension = 1:
o The ICV is calculated over the fields <hash-function>,
<cryptographic-function>, <key-id-length>, and -- if present --
<key-id> (in that order), followed by the entire packet, including
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the Packet Header, including all Packet TLVs (other than ICV
Packet TLVs), and all included messages. The considerations of
<a href="#section-8.1">Section 8.1</a> MUST be applied.
When determining the <ICV-data> for a packet, with type
extension = 2:
o The same procedure as for type extension = 1 is used, except that
the data used consists of a representation of the source address
of the IP datagram carrying the packet, followed by the remaining
data (as for type extension = 1). The representation of the
source address consists of a single octet containing the address
length, in octets, followed by that many octets containing the
address in network byte order.
<span class="h4"><a class="selflink" id="section-12.2.2" href="#section-12.2.2">12.2.2</a>. ICV Message TLV</span>
When determining the <ICV-data> for a message, with type
extension = 1:
o The ICV is calculated over the fields <hash-function>,
<cryptographic-function>, <key-id-length>, and -- if present --
<key-id> (in that order), followed by the entire message. The
considerations in <a href="#section-9.1">Section 9.1</a> MUST be applied.
When determining the <ICV-data> for a message, with type
extension = 2:
o The same procedure as for type extension = 1 is used, except that
the data used consists of a representation of the source address
of the IP datagram carrying the message, followed by the remaining
data (as for type extension = 1). The representation of the
source address consists of a single octet containing the address
length, in octets, followed by that many octets containing the
address in network byte order.
<span class="h4"><a class="selflink" id="section-12.2.3" href="#section-12.2.3">12.2.3</a>. ICV Address Block TLV</span>
When determining the <ICV-data> for one or more addresses, with type
extension = 1:
o The ICV is calculated over the fields <hash-function>,
<cryptographic-function>, <key-id-length>, and -- if present --
<key-id> (in that order), followed by the addresses, and followed
by any other values -- for example, other Address Block TLV
<value>s that are associated with those addresses. A MANET
routing protocol, or MANET routing protocol extension, using ICV
Address Block TLVs MUST specify how to include any such
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concatenated attribute of the addresses in the verification
process of the ICV. The consideration in <a href="#section-10.1">Section 10.1</a> MUST be
applied.
When determining the <ICV-data> for one or more addresses, with type
extension = 2:
o The same procedure as for type extension = 1 is used, except that
the data used consists of a representation of the source address
of the IP datagram carrying the Address Block, followed by the
remaining data (as for type extension = 1). The representation of
the source address consists of a single octet containing the
address length, in octets, followed by that many octets containing
the address in network byte order.
<span class="h3"><a class="selflink" id="section-12.3" href="#section-12.3">12.3</a>. Example of a Message Including an ICV</span>
The sample message depicted in Figure 1 is derived from <a href="./rfc5444#appendix-E">Appendix E of
[RFC5444]</a>. The message contains an ICV Message TLV, with the value
representing an ICV that is 16 octets long and a key identifier that
is 4 octets long. The type extension of the Message TLV is 1, for
the specific decomposition of an ICV using a cryptographic function
and a hash function, as specified in <a href="#section-12">Section 12</a>.
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Message Type | MF=15 | MAL=3 | Message Length = 82 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Message Originator Address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Hop Limit | Hop Count | Message Sequence Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Message TLV Block Length = 36 | TLV Type | MTLVF = 16 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Value Len = 6 | Value |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Value (cont) |TLV Type = ICV |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| MTLVF = 144 | MTLVExt = 1 |Value Len = 23 | Hash Func |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Crypto Func | KeyID Len = 4 | Key Identifier |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Key Identifier (cont) | ICV Value |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ICV Value (cont) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ICV Value (cont) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ICV Value (cont) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ICV Value (cont) | Num Addr = 2 | ABF = 48 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tail Len = 2 | Mid 0 | Mid 1 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Mid 1 (cont) | Prefix Length | ABTLV Block Length = 0 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Num Addr = 3 | ABF = 128 | Head Len = 2 | Head |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Head (cont) | Mid 0 | Mid 1 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Mid 1 (cont) | Mid 2 |ABTLV Block ...|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|... Length = 9 | TLV Type | ABTLVF = 16 | Value Len = 2 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Value | TLV Type | ABTLVF = 32 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Index Start | Index Stop |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 1: Example Message with ICV
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MF: Message Flags, see <a href="./rfc5444#section-5.2">Section 5.2 of [RFC5444]</a>.
MAL: Message Address Length, see <a href="./rfc5444#section-5.2">Section 5.2 of [RFC5444]</a>.
MTLVF: Message TLV Flags, see <a href="./rfc5444#section-5.4.1">Section 5.4.1 of [RFC5444]</a>.
MTLVExt: Message TLV Type Extension, see <a href="./rfc5444#section-5.4.1">Section 5.4.1 of [RFC5444]</a>.
AF: Address Block Flags, see <a href="./rfc5444#section-5.3">Section 5.3 of [RFC5444]</a>.
ABTLV: Address Block TLV, see <a href="./rfc5444#section-5.4">Section 5.4 of [RFC5444]</a>.
ABTLVF: Address Block TLV Flags, see <a href="./rfc5444#section-5.4.1">Section 5.4.1 of [RFC5444]</a>.
Example Message with ICV - Legend
<span class="h2"><a class="selflink" id="section-13" href="#section-13">13</a>. IANA Considerations</span>
The IANA registrations for TLV Types and the TLV type extension
registries given in this specification replace the identical
registrations and registries from [<a href="./rfc6622" title=""Integrity Check Value and Timestamp TLV Definitions for Mobile Ad Hoc Networks (MANETs)"">RFC6622</a>].
This specification defines the following TLV Types, replacing the
original specifications in [<a href="./rfc6622" title=""Integrity Check Value and Timestamp TLV Definitions for Mobile Ad Hoc Networks (MANETs)"">RFC6622</a>]:
o Two Packet TLV Types, which have been allocated from the 0-223
range of the "Packet TLV Types" repository of [<a href="./rfc5444" title=""Generalized Mobile Ad Hoc Network (MANET) Packet/Message Format"">RFC5444</a>], as
specified in Table 1.
o Two Message TLV Types, which have been allocated from the 0-127
range of the "Message TLV Types" repository of [<a href="./rfc5444" title=""Generalized Mobile Ad Hoc Network (MANET) Packet/Message Format"">RFC5444</a>], as
specified in Table 2.
o Two Address Block TLV Types, which have been allocated from the
0-127 range of the "Address Block TLV Types" repository of
[<a href="./rfc5444" title=""Generalized Mobile Ad Hoc Network (MANET) Packet/Message Format"">RFC5444</a>], as specified in Table 3.
This specification updates the following registries that were created
in [<a href="./rfc6622" title=""Integrity Check Value and Timestamp TLV Definitions for Mobile Ad Hoc Networks (MANETs)"">RFC6622</a>]:
o A type extension registry for each of these TLV types with values
as listed in Tables 1, 2, and 3.
The following terms are used as defined in [<a href="#ref-BCP26" title="">BCP26</a>]: "Namespace",
"Registration", and "Designated Expert".
The following policy is used as defined in [<a href="#ref-BCP26" title="">BCP26</a>]: "Expert Review".
<span class="h3"><a class="selflink" id="section-13.1" href="#section-13.1">13.1</a>. Expert Review: Evaluation Guidelines</span>
For TLV type extensions registries where an Expert Review is
required, the Designated Expert SHOULD take the same general
recommendations into consideration as those specified by [<a href="./rfc5444" title=""Generalized Mobile Ad Hoc Network (MANET) Packet/Message Format"">RFC5444</a>].
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For both TIMESTAMP and ICV TLVs, functionally similar extensions for
Packet, Message, and Address Block TLVs SHOULD be numbered
identically.
<span class="h3"><a class="selflink" id="section-13.2" href="#section-13.2">13.2</a>. Packet TLV Types</span>
IANA has, in accordance with [<a href="./rfc6622" title=""Integrity Check Value and Timestamp TLV Definitions for Mobile Ad Hoc Networks (MANETs)"">RFC6622</a>], made allocations from the
"Packet TLV Types" namespace of [<a href="./rfc5444" title=""Generalized Mobile Ad Hoc Network (MANET) Packet/Message Format"">RFC5444</a>] for the Packet TLVs
specified in Table 1. IANA has modified this allocation as
indicated.
+------+-------------+-----------+
| Type | Description | Reference |
+------+-------------+-----------+
| 5 | ICV | <a href="./rfc7182">RFC 7182</a> |
| 6 | TIMESTAMP | <a href="./rfc7182">RFC 7182</a> |
+------+-------------+-----------+
Table 1: Packet TLV Types
<span class="h3"><a class="selflink" id="section-13.3" href="#section-13.3">13.3</a>. Message TLV Types</span>
IANA has, in accordance with [<a href="./rfc6622" title=""Integrity Check Value and Timestamp TLV Definitions for Mobile Ad Hoc Networks (MANETs)"">RFC6622</a>], made allocations from the
"Message TLV Types" namespace of [<a href="./rfc5444" title=""Generalized Mobile Ad Hoc Network (MANET) Packet/Message Format"">RFC5444</a>] for the Message TLVs
specified in Table 2. IANA has modified this allocation as
indicated.
+------+-------------+-----------+
| Type | Description | Reference |
+------+-------------+-----------+
| 5 | ICV | <a href="./rfc7182">RFC 7182</a> |
| 6 | TIMESTAMP | <a href="./rfc7182">RFC 7182</a> |
+------+-------------+-----------+
Table 2: Message TLV Types
<span class="h3"><a class="selflink" id="section-13.4" href="#section-13.4">13.4</a>. Address Block TLV Types</span>
IANA has, in accordance with [<a href="./rfc6622" title=""Integrity Check Value and Timestamp TLV Definitions for Mobile Ad Hoc Networks (MANETs)"">RFC6622</a>], made allocations from the
"Address Block TLV Types" namespace of [<a href="./rfc5444" title=""Generalized Mobile Ad Hoc Network (MANET) Packet/Message Format"">RFC5444</a>] for the Packet TLVs
specified in Table 3. IANA has modified this allocation as
indicated.
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+------+-------------+-----------+
| Type | Description | Reference |
+------+-------------+-----------+
| 5 | ICV | <a href="./rfc7182">RFC 7182</a> |
| 6 | TIMESTAMP | <a href="./rfc7182">RFC 7182</a> |
+------+-------------+-----------+
Table 3: Address Block TLV Types
<span class="h3"><a class="selflink" id="section-13.5" href="#section-13.5">13.5</a>. ICV Packet TLV Type Extensions</span>
IANA has, in accordance with [<a href="./rfc6622" title=""Integrity Check Value and Timestamp TLV Definitions for Mobile Ad Hoc Networks (MANETs)"">RFC6622</a>], made allocations from the
"ICV Packet TLV Type Extensions" namespace of [<a href="./rfc6622" title=""Integrity Check Value and Timestamp TLV Definitions for Mobile Ad Hoc Networks (MANETs)"">RFC6622</a>] for the
Packet TLVs specified in Table 4. IANA has modified this allocation
(including defining type extension = 2) as indicated.
+-----------+-------------------------------------------+-----------+
| Type | Description | Reference |
| Extension | | |
+-----------+-------------------------------------------+-----------+
| 0 | ICV of a packet | <a href="./rfc7182">RFC 7182</a> |
| 1 | ICV, using a cryptographic function and a | <a href="./rfc7182">RFC 7182</a> |
| | hash function, as specified in <a href="#section-12">Section 12</a> | |
| | of this document | |
| 2 | ICV, using a cryptographic function and a | <a href="./rfc7182">RFC 7182</a> |
| | hash function, and including the IP | |
| | datagram source address, as specified in | |
| | <a href="#section-12">Section 12</a> of this document | |
| 3-251 | Unassigned; Expert Review | |
| 252-255 | Reserved for Experimental Use | <a href="./rfc7182">RFC 7182</a> |
+-----------+-------------------------------------------+-----------+
Table 4: ICV Packet TLV Type Extensions
More than one ICV Packet TLV with the same type extension MAY be
included in a packet if these represent different ICV calculations
(e.g., with type extension 1 or 2 and different cryptographic
function and/or hash function or with a different key identifier).
ICV Packet TLVs that carry what is declared to be the same
information MUST NOT be included in the same packet.
<span class="h3"><a class="selflink" id="section-13.6" href="#section-13.6">13.6</a>. TIMESTAMP Packet TLV Type Extensions</span>
IANA has, in accordance with [<a href="./rfc6622" title=""Integrity Check Value and Timestamp TLV Definitions for Mobile Ad Hoc Networks (MANETs)"">RFC6622</a>], made allocations from the
"TIMESTAMP Packet TLV Type Extensions" namespace of [<a href="./rfc6622" title=""Integrity Check Value and Timestamp TLV Definitions for Mobile Ad Hoc Networks (MANETs)"">RFC6622</a>] for the
Packet TLVs specified in Table 5. IANA has modified this allocation
as indicated.
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+-----------+-------------------------------------------+-----------+
| Type | Description | Reference |
| Extension | | |
+-----------+-------------------------------------------+-----------+
| 0 | Unsigned timestamp of arbitrary length, | <a href="./rfc7182">RFC 7182</a> |
| | given by the TLV Length field. The MANET | |
| | routing protocol has to define how to | |
| | interpret this timestamp | |
| 1 | Unsigned 32-bit timestamp, as specified | <a href="./rfc7182">RFC 7182</a> |
| | in [<a href="#ref-IEEE1003.1-2008">IEEE1003.1-2008</a>] | |
| 2 | NTP timestamp format, as specified in | <a href="./rfc7182">RFC 7182</a> |
| | [<a href="./rfc5905" title=""Network Time Protocol Version 4: Protocol and Algorithms Specification"">RFC5905</a>] | |
| 3 | Signed timestamp of arbitrary length with | <a href="./rfc7182">RFC 7182</a> |
| | no constraints such as monotonicity. In | |
| | particular, it may represent any random | |
| | value | |
| 4-251 | Unassigned; Expert Review | |
| 252-255 | Reserved for Experimental Use | <a href="./rfc7182">RFC 7182</a> |
+-----------+-------------------------------------------+-----------+
Table 5: TIMESTAMP Packet TLV Type Extensions
More than one TIMESTAMP Packet TLV with the same type extension MUST
NOT be included in a packet.
<span class="h3"><a class="selflink" id="section-13.7" href="#section-13.7">13.7</a>. ICV Message TLV Type Extensions</span>
IANA has, in accordance with [<a href="./rfc6622" title=""Integrity Check Value and Timestamp TLV Definitions for Mobile Ad Hoc Networks (MANETs)"">RFC6622</a>], made allocations from the
"ICV Message TLV Type Extensions" namespace of [<a href="./rfc6622" title=""Integrity Check Value and Timestamp TLV Definitions for Mobile Ad Hoc Networks (MANETs)"">RFC6622</a>] for the
Message TLVs specified in Table 6. IANA has modified this allocation
(including defining type extension = 2) as indicated.
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+-----------+-------------------------------------------+-----------+
| Type | Description | Reference |
| Extension | | |
+-----------+-------------------------------------------+-----------+
| 0 | ICV of a message | <a href="./rfc7182">RFC 7182</a> |
| 1 | ICV, using a cryptographic function and a | <a href="./rfc7182">RFC 7182</a> |
| | hash function, as specified in <a href="#section-12">Section 12</a> | |
| | of this document | |
| 2 | ICV, using a cryptographic function and a | <a href="./rfc7182">RFC 7182</a> |
| | hash function, and including the IP | |
| | datagram source address, as specified in | |
| | <a href="#section-12">Section 12</a> of this document | |
| 3-251 | Unassigned; Expert Review | |
| 252-255 | Reserved for Experimental Use | <a href="./rfc7182">RFC 7182</a> |
+-----------+-------------------------------------------+-----------+
Table 6: ICV Message TLV Type Extensions
More than one ICV Message TLV with the same type extension MAY be
included in a message if these represent different ICV calculations
(e.g., with type extension 1 or 2 and different cryptographic
function and/or hash function or with a different key identifier).
ICV Message TLVs that carry what is declared to be the same
information MUST NOT be included in the same message.
<span class="h3"><a class="selflink" id="section-13.8" href="#section-13.8">13.8</a>. TIMESTAMP Message TLV Type Extensions</span>
IANA has, in accordance with [<a href="./rfc6622" title=""Integrity Check Value and Timestamp TLV Definitions for Mobile Ad Hoc Networks (MANETs)"">RFC6622</a>], made allocations from the
"TIMESTAMP Message TLV Type Extensions" namespace of [<a href="./rfc6622" title=""Integrity Check Value and Timestamp TLV Definitions for Mobile Ad Hoc Networks (MANETs)"">RFC6622</a>] for
the Message TLVs specified in Table 7. IANA has modified this
allocation as indicated.
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+-----------+-------------------------------------------+-----------+
| Type | Description | Reference |
| Extension | | |
+-----------+-------------------------------------------+-----------+
| 0 | Unsigned timestamp of arbitrary length, | <a href="./rfc7182">RFC 7182</a> |
| | given by the TLV Length field. The MANET | |
| | routing protocol has to define how to | |
| | interpret this timestamp | |
| 1 | Unsigned 32-bit timestamp, as specified | <a href="./rfc7182">RFC 7182</a> |
| | in POSIX [<a href="#ref-IEEE1003.1-2008">IEEE1003.1-2008</a>] | |
| 2 | NTP timestamp format, as specified in | <a href="./rfc7182">RFC 7182</a> |
| | [<a href="./rfc5905" title=""Network Time Protocol Version 4: Protocol and Algorithms Specification"">RFC5905</a>] | |
| 3 | Signed timestamp of arbitrary length with | <a href="./rfc7182">RFC 7182</a> |
| | no constraints such as monotonicity. In | |
| | particular, it may represent any random | |
| | value | |
| 4-251 | Unassigned; Expert Review | |
| 252-255 | Reserved for Experimental Use | <a href="./rfc7182">RFC 7182</a> |
+-----------+-------------------------------------------+-----------+
Table 7: TIMESTAMP Message TLV Type Extensions
More than one TIMESTAMP Message TLV with the same type extension MUST
NOT be included in a message.
<span class="h3"><a class="selflink" id="section-13.9" href="#section-13.9">13.9</a>. ICV Address Block TLV Type Extensions</span>
IANA has, in accordance with [<a href="./rfc6622" title=""Integrity Check Value and Timestamp TLV Definitions for Mobile Ad Hoc Networks (MANETs)"">RFC6622</a>], made allocations from the
"ICV Address Block TLV Type Extensions" namespace of [<a href="./rfc6622" title=""Integrity Check Value and Timestamp TLV Definitions for Mobile Ad Hoc Networks (MANETs)"">RFC6622</a>] for
the Address Block TLVs specified in Table 8. IANA has modified this
allocation (including defining type extension = 2) as indicated.
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+-----------+-------------------------------------------+-----------+
| Type | Description | Reference |
| Extension | | |
+-----------+-------------------------------------------+-----------+
| 0 | ICV of an object (e.g., an address) | <a href="./rfc7182">RFC 7182</a> |
| 1 | ICV, using a cryptographic function and a | <a href="./rfc7182">RFC 7182</a> |
| | hash function, as specified in <a href="#section-12">Section 12</a> | |
| | of this document | |
| 2 | ICV, using a cryptographic function and a | <a href="./rfc7182">RFC 7182</a> |
| | hash function, and including the IP | |
| | datagram source address, as specified in | |
| | <a href="#section-12">Section 12</a> of this document | |
| 3-251 | Unassigned; Expert Review | |
| 252-255 | Reserved for Experimental Use | <a href="./rfc7182">RFC 7182</a> |
+-----------+-------------------------------------------+-----------+
Table 8: ICV Address Block TLV Type Extensions
More than one ICV Address Block TLV with the same type extension MAY
be associated with an address if these represent different ICV
calculations (e.g., with type extension = 1 or type extension = 2 and
different cryptographic function and/or hash function or with a
different key identifier). ICV Address Block TLVs that carry what is
declared to be the same information MUST NOT be associated with the
same address.
<span class="h3"><a class="selflink" id="section-13.10" href="#section-13.10">13.10</a>. TIMESTAMP Address Block TLV Type Extensions</span>
IANA has, in accordance with [<a href="./rfc6622" title=""Integrity Check Value and Timestamp TLV Definitions for Mobile Ad Hoc Networks (MANETs)"">RFC6622</a>], made allocations from the
"TIMESTAMP Address Block TLV Type Extensions" namespace of [<a href="./rfc6622" title=""Integrity Check Value and Timestamp TLV Definitions for Mobile Ad Hoc Networks (MANETs)"">RFC6622</a>]
for the Address Block TLVs specified in Table 9. IANA has modified
this allocation as indicated.
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+-----------+-------------------------------------------+-----------+
| Type | Description | Reference |
| Extension | | |
+-----------+-------------------------------------------+-----------+
| 0 | Unsigned timestamp of arbitrary length, | <a href="./rfc7182">RFC 7182</a> |
| | given by the TLV Length field. The MANET | |
| | routing protocol has to define how to | |
| | interpret this timestamp | |
| 1 | Unsigned 32-bit timestamp, as specified | <a href="./rfc7182">RFC 7182</a> |
| | in POSIX [<a href="#ref-IEEE1003.1-2008">IEEE1003.1-2008</a>] | |
| 2 | NTP timestamp format, as specified in | <a href="./rfc7182">RFC 7182</a> |
| | [<a href="./rfc5905" title=""Network Time Protocol Version 4: Protocol and Algorithms Specification"">RFC5905</a>] | |
| 3 | Signed timestamp of arbitrary length with | <a href="./rfc7182">RFC 7182</a> |
| | no constraints such as monotonicity. In | |
| | particular, it may represent any random | |
| | value | |
| 4-251 | Unassigned; Expert Review | |
| 252-255 | Reserved for Experimental Use | <a href="./rfc7182">RFC 7182</a> |
+-----------+-------------------------------------------+-----------+
Table 9: TIMESTAMP Address Block TLV Type Extensions
More than one TIMESTAMP Address Block TLV with the same type
extension MUST NOT be associated with any address.
<span class="h3"><a class="selflink" id="section-13.11" href="#section-13.11">13.11</a>. Hash Functions</span>
IANA has, in accordance with [<a href="./rfc6622" title=""Integrity Check Value and Timestamp TLV Definitions for Mobile Ad Hoc Networks (MANETs)"">RFC6622</a>], created a registry for hash
functions that can be used when creating an ICV, as specified in
<a href="#section-12">Section 12</a> of this document. The initial assignments and allocation
policies are specified in Table 10. IANA has modified this
allocation as indicated.
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+---------+-----------+---------------------------------+-----------+
| Value | Algorithm | Description | Reference |
+---------+-----------+---------------------------------+-----------+
| 0 | none | The "identity function": The | <a href="./rfc7182">RFC 7182</a> |
| | | hash value of an object is the | |
| | | object itself | |
| 1 | SHA-1 | [<a href="#ref-NIST-FIPS-180-4">NIST-FIPS-180-4</a>] | <a href="./rfc7182">RFC 7182</a> |
| 2 | SHA-224 | [<a href="#ref-NIST-FIPS-180-4">NIST-FIPS-180-4</a>] | <a href="./rfc7182">RFC 7182</a> |
| 3 | SHA-256 | [<a href="#ref-NIST-FIPS-180-4">NIST-FIPS-180-4</a>] | <a href="./rfc7182">RFC 7182</a> |
| 4 | SHA-384 | [<a href="#ref-NIST-FIPS-180-4">NIST-FIPS-180-4</a>] | <a href="./rfc7182">RFC 7182</a> |
| 5 | SHA-512 | [<a href="#ref-NIST-FIPS-180-4">NIST-FIPS-180-4</a>] | <a href="./rfc7182">RFC 7182</a> |
| 6-251 | | Unassigned; Expert Review | |
| 252-255 | | Reserved for Experimental Use | <a href="./rfc7182">RFC 7182</a> |
+---------+-----------+---------------------------------+-----------+
Table 10: Hash Function Registry
<span class="h3"><a class="selflink" id="section-13.12" href="#section-13.12">13.12</a>. Cryptographic Functions</span>
IANA has, in accordance with [<a href="./rfc6622" title=""Integrity Check Value and Timestamp TLV Definitions for Mobile Ad Hoc Networks (MANETs)"">RFC6622</a>], created a registry for the
cryptographic functions, as specified in <a href="#section-12">Section 12</a> of this document.
Initial assignments and allocation policies are specified in
Table 11. IANA has modified this allocation as indicated.
+---------+-----------+---------------------------------+-----------+
| Value | Algorithm | Description | Reference |
+---------+-----------+---------------------------------+-----------+
| 0 | none | The "identity function": The | <a href="./rfc7182">RFC 7182</a> |
| | | value of an encrypted hash is | |
| | | the hash itself | |
| 1 | RSA | [<a href="./rfc3447" title=""Public-Key Cryptography Standards (PKCS) #1: RSA Cryptography Specifications Version 2.1"">RFC3447</a>] | <a href="./rfc7182">RFC 7182</a> |
| 2 | DSA | [<a href="#ref-NIST-FIPS-186-4">NIST-FIPS-186-4</a>] | <a href="./rfc7182">RFC 7182</a> |
| 3 | HMAC | [<a href="./rfc2104" title=""HMAC: Keyed- Hashing for Message Authentication"">RFC2104</a>] | <a href="./rfc7182">RFC 7182</a> |
| 4 | 3DES | [<a href="#ref-NIST-SP-800-67">NIST-SP-800-67</a>] | <a href="./rfc7182">RFC 7182</a> |
| 5 | AES | [<a href="#ref-NIST-FIPS-197">NIST-FIPS-197</a>] | <a href="./rfc7182">RFC 7182</a> |
| 6 | ECDSA | [<a href="./rfc6090" title=""Fundamental Elliptic Curve Cryptography Algorithms"">RFC6090</a>] | <a href="./rfc7182">RFC 7182</a> |
| 7-251 | | Unassigned; Expert Review | |
| 252-255 | | Reserved for Experimental Use | <a href="./rfc7182">RFC 7182</a> |
+---------+-----------+---------------------------------+-----------+
Table 11: Cryptographic Function Registry
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<span class="h2"><a class="selflink" id="section-14" href="#section-14">14</a>. Security Considerations</span>
This document does not specify a protocol. It provides a syntactical
component for cryptographic ICVs of messages and packets, as defined
in [<a href="./rfc5444" title=""Generalized Mobile Ad Hoc Network (MANET) Packet/Message Format"">RFC5444</a>]. It can be used to address security issues of a MANET
routing protocol or MANET routing protocol extension. As such, it
has the same security considerations as [<a href="./rfc5444" title=""Generalized Mobile Ad Hoc Network (MANET) Packet/Message Format"">RFC5444</a>].
In addition, a MANET routing protocol or MANET routing protocol
extension that uses this specification MUST specify how to use the
framework and the TLVs presented in this document. In addition, the
protection that the MANET routing protocol or MANET routing protocol
extensions attain by using this framework MUST be described.
As an example, a MANET routing protocol that uses this component to
reject "badly formed" or "insecure" messages if a control message
does not contain a valid ICV SHOULD indicate the security assumption
that if the ICV is valid, the message is considered valid. It also
SHOULD indicate the security issues that are counteracted by this
measure (e.g., link or identity spoofing) as well as the issues that
are not counteracted (e.g., compromised keys).
<span class="h2"><a class="selflink" id="section-15" href="#section-15">15</a>. Acknowledgements</span>
The authors would like to thank Bo Berry (Cisco), Alan Cullen (BAE
Systems), Justin Dean (NRL), Paul Lambert (Marvell), Jerome Milan
(Ecole Polytechnique), and Henning Rogge (FGAN) for their
constructive comments on [<a href="./rfc6622" title=""Integrity Check Value and Timestamp TLV Definitions for Mobile Ad Hoc Networks (MANETs)"">RFC6622</a>].
The authors also appreciate the detailed reviews of [<a href="./rfc6622" title=""Integrity Check Value and Timestamp TLV Definitions for Mobile Ad Hoc Networks (MANETs)"">RFC6622</a>] from
the Area Directors, in particular Stewart Bryant (Cisco), Stephen
Farrell (Trinity College Dublin), and Robert Sparks (Tekelec), as
well as Donald Eastlake (Huawei) from the Security Directorate.
The authors would like to thank Justin Dean (NRL) and Henning Rogge
(FGAN) for their constructive comments on this specification.
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<span class="h2"><a class="selflink" id="section-16" href="#section-16">16</a>. References</span>
<span class="h3"><a class="selflink" id="section-16.1" href="#section-16.1">16.1</a>. Normative References</span>
[<a id="ref-BCP26">BCP26</a>] Narten, T. and H. Alvestrand, "Guidelines for Writing an
IANA Considerations Section in RFCs", <a href="https://www.rfc-editor.org/bcp/bcp26">BCP 26</a>, <a href="./rfc5226">RFC 5226</a>,
May 2008.
[<a id="ref-IEEE1003.1-2008">IEEE1003.1-2008</a>]
IEEE, "Portable Operating System Interface (POSIX)", IEEE
1003.1-2008, Base Specifications, Issue 7, December 2008.
[<a id="ref-NIST-FIPS-180-4">NIST-FIPS-180-4</a>]
National Institute of Standards and Technology, "Secure
Hash Standard (SHS)", FIPS 180-4, March 2012.
[<a id="ref-NIST-FIPS-186-4">NIST-FIPS-186-4</a>]
National Institute of Standards and Technology, "Digital
Signature Standard (DSS)", FIPS 186-4, July 2013.
[<a id="ref-NIST-FIPS-197">NIST-FIPS-197</a>]
National Institute of Standards and Technology,
"Specification for the Advanced Encryption Standard
(AES)", FIPS 197, November 2001.
[<a id="ref-NIST-SP-800-107">NIST-SP-800-107</a>]
National Institute of Standards and Technology,
"Recommendation for Applications Using Approved Hash
Algorithms", SP 800-107, Revision 1, August 2012.
[<a id="ref-NIST-SP-800-67">NIST-SP-800-67</a>]
National Institute of Standards and Technology,
"Recommendation for the Triple Data Encryption Algorithm
(TDEA) Block Cipher", Special Publication 800-67, Revision
1, January 2012.
[<a id="ref-RFC2104">RFC2104</a>] Krawczyk, H., Bellare, M., and R. Canetti, "HMAC: Keyed-
Hashing for Message Authentication", <a href="./rfc2104">RFC 2104</a>, February
1997.
[<a id="ref-RFC2119">RFC2119</a>] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", <a href="https://www.rfc-editor.org/bcp/bcp14">BCP 14</a>, <a href="./rfc2119">RFC 2119</a>, March 1997.
[<a id="ref-RFC3447">RFC3447</a>] Jonsson, J. and B. Kaliski, "Public-Key Cryptography
Standards (PKCS) #1: RSA Cryptography Specifications
Version 2.1", <a href="./rfc3447">RFC 3447</a>, February 2003.
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[<a id="ref-RFC4493">RFC4493</a>] Song, JH., Poovendran, R., Lee, J., and T. Iwata, "The
AES-CMAC Algorithm", <a href="./rfc4493">RFC 4493</a>, June 2006.
[<a id="ref-RFC5444">RFC5444</a>] Clausen, T., Dearlove, C., Dean, J., and C. Adjih,
"Generalized Mobile Ad Hoc Network (MANET) Packet/Message
Format", <a href="./rfc5444">RFC 5444</a>, February 2009.
[<a id="ref-RFC5905">RFC5905</a>] Mills, D., Martin, J., Burbank, J., and W. Kasch, "Network
Time Protocol Version 4: Protocol and Algorithms
Specification", <a href="./rfc5905">RFC 5905</a>, June 2010.
[<a id="ref-RFC6090">RFC6090</a>] McGrew, D., Igoe, K., and M. Salter, "Fundamental Elliptic
Curve Cryptography Algorithms", <a href="./rfc6090">RFC 6090</a>, February 2011.
<span class="h3"><a class="selflink" id="section-16.2" href="#section-16.2">16.2</a>. Informative References</span>
[<a id="ref-RFC6130">RFC6130</a>] Clausen, T., Dearlove, C., and J. Dean, "Mobile Ad Hoc
Network (MANET) Neighborhood Discovery Protocol (NHDP)",
<a href="./rfc6130">RFC 6130</a>, April 2011.
[<a id="ref-RFC6622">RFC6622</a>] Herberg, U. and T. Clausen, "Integrity Check Value and
Timestamp TLV Definitions for Mobile Ad Hoc Networks
(MANETs)", <a href="./rfc6622">RFC 6622</a>, May 2012.
[<a id="ref-RFC7181">RFC7181</a>] Clausen, T., Dearlove, C., Jacquet, P., and U. Herberg,
"The Optimized Link State Routing Protocol Version 2", <a href="./rfc7181">RFC</a>
<a href="./rfc7181">7181</a>, April 2014.
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Authors' Addresses
Ulrich Herberg
Fujitsu Laboratories of America
1240 E. Arques Ave.
Sunnyvale, CA 94085
USA
EMail: [email protected]
URI: <a href="http://www.herberg.name/">http://www.herberg.name/</a>
Thomas Heide Clausen
LIX, Ecole Polytechnique
91128 Palaiseau Cedex
France
Phone: +33 6 6058 9349
EMail: [email protected]
URI: <a href="http://www.thomasclausen.org/">http://www.thomasclausen.org/</a>
Christopher Dearlove
BAE Systems Advanced Technology Centre
West Hanningfield Road
Great Baddow, Chelmsford
United Kingdom
Phone: +44 1245 242194
EMail: [email protected]
URI: <a href="http://www.baesystems.com/">http://www.baesystems.com/</a>
Herberg, et al. Standards Track [Page 31]
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