Mobile Ad hoc Networking (MANET) U. Herberg Internet-Draft Fujitsu Laboratories of America Obsoletes: 6622 (if approved) T. Clausen Intended status: Standards Track LIX, Ecole Polytechnique Expires: August 29, 2013 C. Dearlove BAE Systems ATC February 25, 2013 Integrity Check Value and Timestamp TLV Definitions for Mobile Ad Hoc Networks (MANETs) draft-herberg-manet-rfc6622-bis-01 Abstract This document extends and replaces RFC 6622. It describes general and flexible TLVs for representing cryptographic Integrity Check Values (ICVs) (i.e., digital signatures or Message Authentication Codes (MACs)) as well as 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 an address, respectively. 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 August 29, 2013. Copyright Notice Copyright (c) 2013 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 Herberg, et al. Expires August 29, 2013 [Page 1] Internet-Draft ICV and Timestamp TLVs for MANETs February 2013 (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 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 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3 3. Applicability Statement . . . . . . . . . . . . . . . . . . . 3 4. Security Architecture . . . . . . . . . . . . . . . . . . . . 4 5. Overview and Functioning . . . . . . . . . . . . . . . . . . . 5 6. General ICV TLV Structure . . . . . . . . . . . . . . . . . . 6 7. General Timestamp TLV Structure . . . . . . . . . . . . . . . 6 8. Packet TLVs . . . . . . . . . . . . . . . . . . . . . . . . . 7 8.1. Packet ICV TLV . . . . . . . . . . . . . . . . . . . . . . 7 8.2. Packet TIMESTAMP TLV . . . . . . . . . . . . . . . . . . . 7 9. Message TLVs . . . . . . . . . . . . . . . . . . . . . . . . . 7 9.1. Message ICV TLV . . . . . . . . . . . . . . . . . . . . . 8 9.2. Message TIMESTAMP TLV . . . . . . . . . . . . . . . . . . 8 10. Address Block TLVs . . . . . . . . . . . . . . . . . . . . . . 8 10.1. Address Block ICV TLV . . . . . . . . . . . . . . . . . . 8 10.2. Address Block TIMESTAMP TLV . . . . . . . . . . . . . . . 9 11. ICV: Basic . . . . . . . . . . . . . . . . . . . . . . . . . . 9 12. ICV: Hash Function and Cryptographic Function . . . . . . . . 9 12.1. General ICV TLV Structure . . . . . . . . . . . . . . . . 9 12.1.1. Rationale . . . . . . . . . . . . . . . . . . . . . . 10 12.2. Considerations for Calculating the ICV . . . . . . . . . . 11 12.2.1. Packet ICV TLV . . . . . . . . . . . . . . . . . . . 11 12.2.2. Message ICV TLV . . . . . . . . . . . . . . . . . . . 11 12.2.3. Address Block ICV TLV . . . . . . . . . . . . . . . . 11 12.3. Example of a Message Including an ICV . . . . . . . . . . 12 13. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 13 13.1. Expert Review: Evaluation Guidelines . . . . . . . . . . . 13 13.2. Packet TLV Type Registrations . . . . . . . . . . . . . . 13 13.3. Message TLV Type Registrations . . . . . . . . . . . . . . 14 13.4. Address Block TLV Type Registrations . . . . . . . . . . . 15 13.5. Hash Functions . . . . . . . . . . . . . . . . . . . . . . 16 13.6. Cryptographic Functions . . . . . . . . . . . . . . . . . 17 14. Security Considerations . . . . . . . . . . . . . . . . . . . 18 15. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 18 16. References . . . . . . . . . . . . . . . . . . . . . . . . . . 18 16.1. Normative References . . . . . . . . . . . . . . . . . . . 18 16.2. Informative References . . . . . . . . . . . . . . . . . . 20 Herberg, et al. Expires August 29, 2013 [Page 2] Internet-Draft ICV and Timestamp TLVs for MANETs February 2013 1. Introduction This document, which extends and replaces [RFC6622], specifies: o Two TLVs for carrying Integrity Check Values (ICVs) and timestamps in packets, messages, and address blocks as defined by [RFC5444]. o A generic framework for ICVs, accounting (for Message TLVs) for mutable message header fields ( and ), where these fields are present in messages. This document retains the IANA registries, defined in [RFC6622], for recording code points for hash-functions, cryptographic functions, and ICV calculations. This document requests additional allocations from these registries. Moreover, in Section 12, this document defines the following: o A method for generating ICVs using a combination of a cryptographic function and a hash function. 2. Terminology 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 [RFC2119]. This document uses the terminology and notation defined in [RFC5444]. In particular, the following TLV fields from [RFC5444] are used in this specification: is the hop limit of a message, as specified in Section 5.2 of [RFC5444]. is the hop count of a message, as specified in Section 5.2 of [RFC5444]. is the length of a TLV in octets, as specified in Section 5.4.1 of [RFC5444]. 3. Applicability Statement MANET routing protocols using the format defined in [RFC5444] 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. Herberg, et al. Expires August 29, 2013 [Page 3] Internet-Draft ICV and Timestamp TLVs for MANETs February 2013 This document specifies how to include an ICV for a packet, a message, and addresses in address blocks within a message, using such TLVs. This document also specifies how to treat "mutable" fields, specifically the and 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 Section 12, an example method for calculating such ICVs is given, using a cryptographic function over the hash value of the content. 4. Security Architecture Basic MANET routing protocol specifications are often "oblivious to security"; however, they have a clause allowing a control message to be rejected as "badly formed" or "insecure" prior to the message being processed or forwarded. MANET routing protocols such as the Neighborhood Discovery Protocol (NHDP) [RFC6130] and the Optimized Link State Routing Protocol version 2 [OLSRv2] 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 Security-oblivious MANET routing protocol specifications, 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, 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 issues listed above by specifying a common exchange format for cryptographic ICVs, making reservations from within the Packet TLV, Message TLV, and Address Herberg, et al. Expires August 29, 2013 [Page 4] Internet-Draft ICV and Timestamp TLVs for MANETs February 2013 Block TLV registries of [RFC5444], to be used (and shared) among MANET routing protocol security extensions. For the specific decomposition of an ICV into a cryptographic function over a hash value (specified in Section 12), this document reports the two IANA registries from [RFC6622] for code points for hash functions and cryptographic functions adhering to [RFC5444]. With respect to [RFC5444], this document is: o Intended to be used in the non-normative, but intended, mode of use described in Appendix B of [RFC5444]. o A specific example of the Security Considerations section of [RFC5444] (the authentication part). 5. Overview and Functioning This document specifies a syntactical representation of security- related information for use with [RFC5444] addresses, messages, and packets, and also reports and updates IANA registrations (from [RFC6622]) 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 reports previously assigned TLV types (from [RFC6622]) from the registries defined for Packet, Message, and Address Block TLVs in [RFC5444]. 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 reports and updates these type extension registries, in order to specify internal structure (and accompanying processing) of the field of a TLV. For example, and as defined in this document, an ICV TLV with type extension = 0 specifies that the field has no pre-defined internal structure but is simply a sequence of octets. An ICV TLV with type extension = 1 specifies that the field has a pre- defined internal structure and defines its interpretation. An ICV TLV with type extension = 2 specifies a modified version of this definition. (Specifically, with type extension = 1 or type extension Herberg, et al. Expires August 29, 2013 [Page 5] Internet-Draft ICV and Timestamp TLVs for MANETs February 2013 = 2, the field contains the result of combining a cryptographic function and a hash function, calculated over the contents of the packet, message or address block, with sub-fields indicating which hash function and cryptographic function have been used; this is specified in Section 12. The difference between the two type extensions is that the ICV TLV with type extension = 2 is calculated also over the source address of the IP datagram carrying the packet, message, or address block.) Other documents can request assignments for other type extensions; if they do so, they MUST specify their internal structure (if any) and interpretation. 6. General ICV TLV Structure The value of the ICV TLV is: := where is a field, of octets, which contains the information to be interpreted by the ICV verification process, as specified by the type extension. Note that this does not stipulate how to calculate the nor the internal structure thereof, if any; such information MUST be specified by way of the type extension for the ICV TLV type. See Section 13. This document specifies three such type extensions -- one for ICVs without pre-defined structures, and two for ICVs constructed combining a cryptographic function and a hash function. 7. General Timestamp TLV Structure The value of the Timestamp TLV is: := where: is an unsigned integer field, of length , which contains the timestamp. Note that this does not stipulate how to calculate the nor the internal structure thereof, if any; such information MUST be specified by way of the type extension for the TIMESTAMP TLV type. See Section 13. Herberg, et al. Expires August 29, 2013 [Page 6] Internet-Draft ICV and Timestamp TLVs for MANETs February 2013 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 UNIX timestamp, GPS timestamp, or a simple sequence number. 8. Packet TLVs 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. 8.1. Packet ICV TLV A Packet ICV TLV is an example of an ICV TLV as described in Section 6. The following considerations apply: o Because packets as defined in [RFC5444] are never forwarded by routers, no special considerations are required regarding mutable fields (e.g., and ), if present within any messages in the packet, when calculating the ICV. o Any Packet ICV 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. Removed ICV TLVs MUST be restored after having calculated the ICV value. The rationale for removing any Packet ICV TLV already present prior to calculating the ICV is that several ICVs may be added to the same packet, e.g., using different ICV functions. 8.2. Packet TIMESTAMP TLV A Packet TIMESTAMP TLV is an example of a Timestamp TLV as described in Section 7. If a packet contains a TIMESTAMP TLV and an ICV TLV, the TIMESTAMP TLV SHOULD be added to the packet before any ICV TLV, in order that it be included in the calculation of the ICV. 9. Message TLVs 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. Herberg, et al. Expires August 29, 2013 [Page 7] Internet-Draft ICV and Timestamp TLVs for MANETs February 2013 9.1. Message ICV TLV A Message ICV TLV is an example of an ICV TLV as described in Section 6. When determining the for a message, the following considerations MUST be applied: o The fields and , if present, MUST both be assumed to have the value 0 (zero) when calculating the ICV. o Any Message ICV 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. Removed ICV TLVs MUST be restored after having calculated the ICV value. The rationale for removing any Message ICV TLV already present prior to calculating the ICV is that several ICVs may be added to the same message, e.g., using different ICV functions. 9.2. Message TIMESTAMP TLV A Message TIMESTAMP TLV is an example of a Timestamp TLV as described in Section 7. If a message contains a TIMESTAMP TLV and an ICV TLV, the TIMESTAMP TLV SHOULD be added to the message before the ICV TLV, in order that it be included in the calculation of the ICV. 10. Address Block TLVs Two Address Block TLVs are defined: one for associating a cryptographic ICV to an address and one for including the timestamp indicating the time at which the cryptographic ICV was calculated. 10.1. Address Block ICV TLV An Address Block ICV TLV is an example of an ICV TLV as described in Section 6. The ICV is calculated over the address, concatenated with any other values -- for example, any other Address Block TLV fields -- associated with that address. A MANET routing protocol or MANET routing protocol extension using Address Block ICV TLVs MUST specify how to include any such concatenated attribute of the address in the verification process of the ICV. When determining the for an address, the following consideration MUST be applied: o If other TLV values are concatenated with the address for calculating the ICV, these TLVs MUST NOT be Address Block ICV TLVs already associated with the address. Herberg, et al. Expires August 29, 2013 [Page 8] Internet-Draft ICV and Timestamp TLVs for MANETs February 2013 The rationale for not concatenating the address with any ICV TLV values already associated with the address when calculating the ICV is that several ICVs may be added to the same address, e.g., using different ICV functions. 10.2. Address Block TIMESTAMP TLV An Address Block TIMESTAMP TLV is an example of a Timestamp TLV as described in Section 7. If both a TIMESTAMP TLV and an ICV TLV are associated with an address, the TIMESTAMP TLV MUST be covered when calculating the value of the ICV to be contained in the ICV TLV value (i.e., concatenated with the associated address and any other values as described in Section 10.1). 11. ICV: Basic The basic ICV, represented by way of an ICV TLV with type extension = 0, is a simple bit-field containing the cryptographic ICV. This assumes that the mechanism stipulating how ICVs are calculated and verified is established outside of this specification, e.g., by way of administrative configuration or external out-of-band signaling. Thus, the , when using type extension = 0, is := where: is an unsigned integer field, of length , which contains the cryptographic ICV. 12. ICV: Hash Function and Cryptographic Function 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. 12.1. General ICV TLV Structure 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: := Herberg, et al. Expires August 29, 2013 [Page 9] Internet-Draft ICV and Timestamp TLVs for MANETs February 2013 where: is an 8-bit unsigned integer field specifying the hash function. is an 8-bit unsigned integer field specifying the cryptographic function. is an 8-bit unsigned integer field specifying the length of the field in number of octets. The value 0x00 is reserved for using a pre-installed, shared key. 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 equals 0x00, the field is not contained in the TLV, and a pre-installed, shared key is used. is an unsigned integer field, whose length is - 3 - , and which 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 HMAC function, which is specified as defined in Section 13.6, which applies the hash function twice. The hash function and the cryptographic function correspond to the entries in two IANA registries, which are reported by this specification and are described in Section 13. 12.1.1. Rationale 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. The rationale for not including a field that lists parameters of the Herberg, et al. Expires August 29, 2013 [Page 10] Internet-Draft ICV and Timestamp TLVs for MANETs February 2013 cryptographic ICV in the TLV is that, before being able to validate a cryptographic ICV, routers have to exchange or acquire keys (e.g., public keys). Any additional parameters can be provided together with the keys in that bootstrap process. It is therefore not necessary, and would even entail an extra overhead, to transmit the parameters within every message. One implicitly available parameter is the length of the ICV, which is - 3 - , and which depends on the choice of the cryptographic function. 12.2. Considerations for Calculating the ICV The considerations listed in the following subsections MUST be applied when calculating the ICV for Packet, Message, and Address Block ICV TLVs, respectively. 12.2.1. Packet ICV TLV When determining the for a packet, with type extension = 1, the ICV is calculated over the fields , , , and -- if present -- (in that order), concatenated with the entire packet, including the packet header, all Packet TLVs (other than Packet ICV TLVs), and all included Messages and their message headers, in accordance with Section 8.1. When determining the for a packet, with type extension = 2, the same procedure is used, except that the source address of the IP datagram carrying the packet is also concatenated, in the first position, with the data used. 12.2.2. Message ICV TLV When determining the for a message, with type extension = 1, the ICV is calculated over the fields , , , and -- if present -- (in that order), concatenated with the entire message. The considerations in Section 9.1 MUST be applied. When determining the for a message, with type extension = 2, the same procedure is used, except that the source address of the IP datagram carrying the message is also concatenated, in the first position, with the data used. 12.2.3. Address Block ICV TLV When determining the for an address, block, with type extension = 2, the ICV is calculated over the fields , , , and -- if present -- (in that order), concatenated with the address, and concatenated with any other values -- for example, any other address block TLV that is associated with that address. A MANET Herberg, et al. Expires August 29, 2013 [Page 11] Internet-Draft ICV and Timestamp TLVs for MANETs February 2013 routing protocol or MANET routing protocol extension using Address Block ICV TLVs MUST specify how to include any such concatenated attribute of the address in the verification process of the ICV. The considerations in Section 10.1 MUST be applied. When determining the for an address block, with type extension = 2, the same procedure is used, except that the source address of the IP datagram carrying the address block is also concatenated, in the first position, with the data used. 12.3. Example of a Message Including an ICV The sample message depicted in Figure 1 is derived from Appendix D of [RFC5444]. The message contains an ICV Message TLV, with the value representing an ICV that is 16 octets long of the whole message, 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 Section 12. 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | PV=0 | PF=8 | Packet Sequence Number | Message Type | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | MF=15 | MAL=3 | Message Length = 44 | Msg Orig Addr | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Message Originator Address (cont) | Hop Limit | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Hop Count | Message Sequence Number | Msg TLV Block | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Length = 27 | ICV | MTLVF = 144 | MTLVExt = 1 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |Value Len = 23 | Hash Func | Crypto Func |Key ID length=4| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Key Identifier | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ICV Value | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ICV Value (cont) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ICV Value (cont) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ICV Value (cont) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 1: Example Message with ICV Herberg, et al. Expires August 29, 2013 [Page 12] Internet-Draft ICV and Timestamp TLVs for MANETs February 2013 13. IANA Considerations This specification reports the following, originally specified in [RFC6622]: o Two Packet TLV types, which have been allocated from the 0-223 range of the "Packet TLV Types" repository of [RFC5444], 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 [RFC5444], 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 [RFC5444], as specified in Table 3. This specification updates the following, created in [RFC6622]: 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 [BCP26]: "Namespace", "Registration", and "Designated Expert". The following policy is used as defined in [BCP26]: "Expert Review". 13.1. Expert Review: Evaluation Guidelines 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 [RFC5444]. For the Timestamp TLV, the same type extensions for all Packet, Message, and Address Block TLVs SHOULD be numbered identically. 13.2. Packet TLV Type Registrations IANA has, in accordance with [RFC6622], made allocations from the "Packet TLV Types" namespace of [RFC5444] for the Packet TLVs specified in Table 1. IANA are requested to modify this allocation (defining type extension = 2) as indicated. Herberg, et al. Expires August 29, 2013 [Page 13] Internet-Draft ICV and Timestamp TLVs for MANETs February 2013 +-----------+------+-----------+------------------------------------+ | Name | Type | Type | Description | | | | Extension | | +-----------+------+-----------+------------------------------------+ | ICV | 5 | 0 | ICV of a packet | | | | 1-2 | ICV, using a cryptographic | | | | | function and a hash function, as | | | | | specified in Section 12 of this | | | | | document | | | | 3-251 | Unassigned; Expert Review | | | | 252-255 | Experimental Use | | TIMESTAMP | 6 | 0 | Unsigned timestamp of arbitrary | | | | | length, 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 in [IEEE 1003.1-2008 | | | | | (POSIX)] | | | | 2 | NTP timestamp format, as defined | | | | | in [RFC5905] | | | | 3 | Signed timestamp of arbitrary | | | | | length with no constraints such as | | | | | monotonicity. In particular, it | | | | | may represent any random value | | | | 4-251 | Unassigned; Expert Review | | | | 252-255 | Experimental Use | +-----------+------+-----------+------------------------------------+ Table 1: Packet TLV Types 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). ICV Packet TLVs that carry what is declared to be the same information MUST NOT be included in the same packet. 13.3. Message TLV Type Registrations IANA has, in accordance with [RFC6622], made allocations from the "Message TLV Types" namespace of [RFC5444] for the Message TLVs specified in Table 2. IANA are requested to modify this allocation (defining type extension = 2) as indicated. Herberg, et al. Expires August 29, 2013 [Page 14] Internet-Draft ICV and Timestamp TLVs for MANETs February 2013 +-----------+------+-----------+------------------------------------+ | Name | Type | Type | Description | | | | Extension | | +-----------+------+-----------+------------------------------------+ | ICV | 5 | 0 | ICV of a message | | | | 1-2 | ICV, using a cryptographic | | | | | function and a hash function, as | | | | | specified in Section 12 of this | | | | | document | | | | 3-251 | Unassigned; Expert Review | | | | 252-255 | Experimental Use | | TIMESTAMP | 6 | 0 | Unsigned timestamp of arbitrary | | | | | length, given by the TLV Length | | | | | field. | | | | 1 | Unsigned 32-bit timestamp, as | | | | | specified in [IEEE 1003.1-2008 | | | | | (POSIX)] | | | | 2 | NTP timestamp format, as defined | | | | | in [RFC5905] | | | | 3 | Signed timestamp of arbitrary | | | | | length with no constraints such as | | | | | monotonicity. In particular, it | | | | | may represent any random value | | | | 4-251 | Unassigned; Expert Review | | | | 252-255 | Experimental Use | +-----------+------+-----------+------------------------------------+ Table 2: Message TLV Types 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). ICV Message TLVs that carry what is declared to be the same information MUST NOT be included in the same message. 13.4. Address Block TLV Type Registrations IANA has, in accordance with [RFC6622], made allocations from the "Address Block TLV Types" namespace of [RFC5444] for the Packet TLVs specified in Table 3. IANA are requested to modify this allocation (defining type extension = 2) as indicated. Herberg, et al. Expires August 29, 2013 [Page 15] Internet-Draft ICV and Timestamp TLVs for MANETs February 2013 +-----------+------+-----------+------------------------------------+ | Name | Type | Type | Description | | | | Extension | | +-----------+------+-----------+------------------------------------+ | ICV | 5 | 0 | ICV of an object (e.g., an | | | | | address) | | | | 1-2 | ICV, using a cryptographic | | | | | function and a hash function, as | | | | | specified in Section 12 of this | | | | | document | | | | 3-251 | Unassigned; Expert Review | | | | 252-255 | Experimental Use | | TIMESTAMP | 6 | 0 | Unsigned timestamp of arbitrary | | | | | length, given by the TLV Length | | | | | field | | | | 1 | Unsigned 32-bit timestamp, as | | | | | specified in [IEEE 1003.1-2008 | | | | | (POSIX)] | | | | 2 | NTP timestamp format, as defined | | | | | in [RFC5905] | | | | 3 | Signed timestamp of arbitrary | | | | | length with no constraints such as | | | | | monotonicity. In particular, it | | | | | may represent any random value | | | | 4-251 | Unassigned; Expert Review | | | | 252-255 | Experimental Use | +-----------+------+-----------+------------------------------------+ Table 3: Address Block TLV Types More than one ICV Address Block TLV with the same type extension MAY be associated with an Address Block if these represent different ICV calculations (e.g., with type extension 1 or 2 and different cryptographic function and/or hash function). ICV Address Block TLVs that carry what is declared to be the same information MUST NOT be associated with the same Address Block. 13.5. Hash Functions IANA has, in accordance with [RFC6622], created a new registry for hash functions that can be used when creating an ICV, as specified in Section 12 of this document. The initial assignments and allocation policies are specified in Table 4. This registry is unchanged by this specification. Herberg, et al. Expires August 29, 2013 [Page 16] Internet-Draft ICV and Timestamp TLVs for MANETs February 2013 +-------------+-----------+-----------------------------------------+ | Hash | Algorithm | Description | | Function | | | | Value | | | +-------------+-----------+-----------------------------------------+ | 0 | none | The "identity function": The hash value | | | | of an object is the object itself | | 1 | SHA1 | [NIST-FIPS-180-2] | | 2 | SHA224 | [NIST-FIPS-180-2-change] | | 3 | SHA256 | [NIST-FIPS-180-2] | | 4 | SHA384 | [NIST-FIPS-180-2] | | 5 | SHA512 | [NIST-FIPS-180-2] | | 6-251 | | Unassigned; Expert Review | | 252-255 | | Experimental Use | +-------------+-----------+-----------------------------------------+ Table 4: Hash Function Registry 13.6. Cryptographic Functions IANA has, in accordance with [RFC6622], created a new registry for the cryptographic functions, as specified in Section 12 of this document. Initial assignments and allocation policies are specified in Table 5. This registry is unchanged by this specification. +----------------+-----------+--------------------------------------+ | Cryptographic | Algorithm | Description | | Function Value | | | +----------------+-----------+--------------------------------------+ | 0 | none | The "identity function": The value | | | | of an encrypted hash is the hash | | | | itself | | 1 | RSA | [RFC3447] | | 2 | DSA | [NIST-FIPS-186-3] | | 3 | HMAC | [RFC2104] | | 4 | 3DES | [NIST-SP-800-67] | | 5 | AES | [NIST-FIPS-197] | | 6 | ECDSA | [ANSI-X9-62-2005] | | 7-251 | | Unassigned; Expert Review | | 252-255 | | Experimental Use | +----------------+-----------+--------------------------------------+ Table 5: Cryptographic Function Registry Herberg, et al. Expires August 29, 2013 [Page 17] Internet-Draft ICV and Timestamp TLVs for MANETs February 2013 14. Security Considerations This document does not specify a protocol. It provides a syntactical component for cryptographic ICVs of messages and packets, as defined in [RFC5444]. 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 [RFC5444]. 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). 15. Acknowledgements 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 [RFC6622]. The authors also appreciate the detailed reviews of [RFC6622] 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. 16. References 16.1. Normative References [BCP26] Narten, T. and H. Alvestrand, "Guidelines for Writing an IANA Considerations Section in RFCs", BCP 26, RFC 5226, May 2008. [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC5444] Clausen, T., Dearlove, C., Dean, J., and Herberg, et al. Expires August 29, 2013 [Page 18] Internet-Draft ICV and Timestamp TLVs for MANETs February 2013 C. Adjih, "Generalized Mobile Ad Hoc Network (MANET) Packet/Message Format", RFC 5444, February 2009. [RFC5905] Mills, D., Martin, J., Ed., Burbank, J., and W. Kasch, "Network Time Protocol Version 4: Protocol and Algorithms Specification", RFC 5905, June 2010. [RFC3447] Jonsson, J. and B. Kaliski, "Public-Key Cryptography Standards (PKCS) #1: RSA Cryptography Specifications Version 2.1", RFC 3447, February 2003. [RFC2104] Krawczyk, H., Bellare, M., and R. Canetti, "HMAC: Keyed-Hashing for Message Authentication", RFC 2104, February 1997. [NIST-FIPS-197] National Institute of Standards and Technology, "Specification for the Advanced Encryption Standard (AES)", FIPS 197, November 2001. [NIST-FIPS-186-3] National Institute of Standards and Technology, "Digital Signature Standard (DSS)", FIPS 186-3, June 2009. [ANSI-X9-62-2005] American National Standards Institute, "Public Key Cryptography for the Financial Services Industry: The Elliptic Curve Digital Signature Algorithm (ECDSA)", ANSI X9.62-2005, November 2005. [NIST-SP-800-67] National Institute of Standards and Technology, "Recommendation for the Triple Data Encryption Algorithm (TDEA) Block Cipher", Special Publication 800-67, May 2004. [NIST-FIPS-180-2] National Institute of Standards and Technology, "Specifications for the Secure Hash Standard", FIPS 180-2, August 2002. [NIST-FIPS-180-2-change] National Institute of Standards and Technology, "Federal Information Processing Standards Publication 180-2 (+ Change Notice to include SHA-224)", Herberg, et al. Expires August 29, 2013 [Page 19] Internet-Draft ICV and Timestamp TLVs for MANETs February 2013 FIPS 180-2, August 2002. [IEEE 1003.1-2008 (POSIX)] IEEE Computer Society, "1003.1-2008 Standard for Information Technology - Portable Operating System Interface (POSIX) Base Specifications, Issue 7", December 2008. 16.2. Informative References [RFC6130] Clausen, T., Dearlove, C., and J. Dean, "Mobile Ad Hoc Network (MANET) Neighborhood Discovery Protocol (NHDP)", RFC 6130, April 2011. [RFC6622] Herberg, U. and T. Clausen, "Integrity Check Value and Timestamp TLV Definitions for Mobile Ad Hoc Networks (MANETs)", RFC 6622, May 2012. [OLSRv2] Clausen, T., Dearlove, C., Jacquet, P., and U. Herberg, "The Optimized Link State Routing Protocol version 2", Work in Progress, March 2012. Authors' Addresses Ulrich Herberg Fujitsu Laboratories of America 1240 E. Arques Ave. Sunnyvale, CA 94085 USA EMail: ulrich@herberg.name URI: http://www.herberg.name/ Thomas Heide Clausen LIX, Ecole Polytechnique 91128 Palaiseau Cedex France Phone: +33 6 6058 9349 EMail: T.Clausen@computer.org URI: http://www.thomasclausen.org/ Herberg, et al. Expires August 29, 2013 [Page 20] Internet-Draft ICV and Timestamp TLVs for MANETs February 2013 Christopher Dearlove BAE Systems ATC Phone: +44 1245 242194 EMail: chris.dearlove@baesystems.com URI: http://www.baesystems.com/ Herberg, et al. Expires August 29, 2013 [Page 21]