Hi all,
The draft: TLS 1.3 Authentication using IEEE 1609.2/ETSI TS 103097 certificates
is updated in accordance with TLS 1.3:
https://tools.ietf.org/html/draft-tls-certieee1609-01
This document describes the use of certificates specified by the Institute of
Electrical and Electronics Engineers IEEE1609.2 and the European
Telecommunications Standards
Institute ETSI TS 103097. These standards are defined in order to secure
communications in vehicular environments.
This extension is very useful and has become a pressing need for
(Vehicle-To-Internet(V2Internet), Vehicle-To-Cloud(V2Cloud),...).
We are soliciting feedback from the WG on the draft.
Kind Regards
Mounira
TLS Working Group P. Kampanakis, Ed.
Internet-Draft Cisco
Intended status: Informational M. Msahli, Ed.
Expires: February 19, 2019 Telecom ParisTech
August 18, 2018
TLS 1.3 Authentication using ETSI TS 103 097 and IEEE 1609.2
certificates
draft-tls-certieee1609-01.txt
Abstract
This document specifies the use of two new certificate types to
authenticate TLS entities. The first type enables the use of a
certificate specified by the Institute of Electrical and Electronics
Engineers (IEEE) [IEEE1609.2] and the second by the European
Telecommunications Standards Institute (ETSI) [TS103097].
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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material or to cite them other than as "work in progress."
This Internet-Draft will expire on February 19, 2019.
Copyright Notice
Copyright (c) 2018 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
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include Simplified BSD License text as described in Section 4.e of
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the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Requirements Terminology . . . . . . . . . . . . . . . . . . 3
3. Extension Overview . . . . . . . . . . . . . . . . . . . . . 3
4. Message Flow . . . . . . . . . . . . . . . . . . . . . . . . 5
4.1. Client Hello . . . . . . . . . . . . . . . . . . . . . . 6
4.2. Server Hello . . . . . . . . . . . . . . . . . . . . . . 6
5. Certificate Verification . . . . . . . . . . . . . . . . . . 6
5.1. IEEE 1609.2 certificates . . . . . . . . . . . . . . . . 6
5.2. ETSI TS 103 097 certificates . . . . . . . . . . . . . . 6
6. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6.1. TLS Server and TLS Client use the 1609Dot2 Certificate . 7
6.2. TLS Server uses the IEEE 1609.2 certificate and TLS
Client uses the X 509 certificate . . . . . . . . . . . . 7
6.3. TLS Server uses the IEEE 1609.2 certificate and TLS
Client uses the ETSI TS 103097 certificate . . . . . . . 8
7. Security Considerations . . . . . . . . . . . . . . . . . . . 9
8. Privacy Considerations . . . . . . . . . . . . . . . . . . . 9
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10
10. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 10
11. References . . . . . . . . . . . . . . . . . . . . . . . . . 10
11.1. Normative References . . . . . . . . . . . . . . . . . . 10
11.2. Informative References . . . . . . . . . . . . . . . . . 11
Appendix A. Co-Authors . . . . . . . . . . . . . . . . . . . . . 12
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 12
1. Introduction
At present, TLS 1.3 protocol [RFC8446] uses X509 and Raw Public Key
in order to authenticate servers and clients. This document
describes the use of certificates specified either by the Institute
of Electrical and Electronics Engineers (IEEE) [IEEE1609.2] or the
European Telecommunications Standards Institute (ETSI) [TS103097].
These standards are defined in order to secure communications in
vehicular environments. Existing authentication methods, such as
X509 and Raw Public Key, are designed for Internet use, particularly
for flexibility and extensibility, and are not optimized for
bandwidth and processing time to support delay-sensitive
applications. This is why size-optimized certificates that meet the
ITS requirements were designed and standardized.
Two new values referring the previously mentioned certificates will
be added to the "client_certificate_type" and the
"server_certificate_type" extensions defined in [RFC7250].
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2. Requirements Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
3. Extension Overview
The extension format for extended Client Hello and Server Hello uses
the "extension_data" field of the "Certificate_Type_Extension"
structue defined in RFC7250. The CertificateType structure is an
enum with values taken from the TLS 1.3 Certificate Types. In order
to negotiate the support of IEEE 1609.2 or ETSI TS 103097
certificate-based authentication, the clients and the servers MAY
include the extension of type "client_certificate_type" and
"server_certificate_type" in the extended client hello and
EncryptedExtensions. The extension_data" field of this extension
SHALL contain a list of supported certificate types proposed by the
client as provided in figure below:
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/* Managed by IANA */
enum {
X509(0),
RawPublicKey(2),
1609Dot2(?), /* Number 3 will be requested for 1609.2 */
(255)
103097(?), /* Number 4 will be requested for 103097 */
(255)
} CertificateType;
struct {
select (certificate_type) {
/* certificate type defined in this document.*/
case 103097:
opaque cert_data<1..2^24-1>;
/* certificate type defined in this document.*/
case 1609Dot2:
opaque cert_data<1..2^24-1>;
/* RawPublicKey defined in RFC 7250*/
case RawPublicKey:
opaque ASN.1_subjectPublicKeyInfo<1..2^24-1>;
/* X.509 certificate defined in RFC 5246*/
case X.509:
opaque cert_data<1..2^24-1>;
};
Extension extensions<0..2^16-1>;
} CertificateEntry;
In case where TLS server accepts the described extension, it selects
one of the certificate types in the extension described here. Note
that a server MAY authenticate the client using other authentication
methods. The client MAY at its discretion either continue the
handshake, or respond with a fatal message alert.
The end-entity certificate's public key has to be compatible with one
of the certificate types listed in extension described here.
Servers aware of the extension described here but not wishing to use
it, SHOULD gracefully not proceed with the negotiation.
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4. Message Flow
The "client_certificate_type" and "server_certificate_type" messages
MUST be sent in handshake phase as illustrated in Figure 1 below.
The reply of the server MUST be sent in EncryptedExtensions.
Client Server
Key ^ ClientHello
Exch | + server_certificate_type*
| + client_certificate_type*
| + key_share*
v + signature_algorithms* -------->
ServerHello ^ Key
+ key_share* v Exch
{EncryptedExtensions} ^ Server
{+ server_certificate_type*}| Params
{+ client_certificate_type*}|
{CertificateRequest*} v
{Certificate*} ^
{CertificateVerify*} | Auth
{Finished} v
<------- [Application Data*]
^ {Certificate*}
Auth | {CertificateVerify*}
v {Finished} -------->
[Application Data] <-------> [Application Data]
+ Indicates noteworthy extensions sent in the
previously noted message.
* Indicates optional or situation-dependent
messages/extensions that are not always sent.
{} Indicates messages protected using keys
derived from a [sender]_handshake_traffic_secret.
[] Indicates messages protected using keys
derived from [sender]_application_traffic_secret_N.
Figure 1: Message Flow with certificate type extension for Full TLS
1.3 Handshake
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4.1. Client Hello
In order to indicate the support of IEEE 1609.2 or ETSI TS 103097
certificates, client MUST include an extension of type
"client_certificate_type" and "server_certificate_type"to the
extended client hello message. The hello extension mechanism is
described in Section 4.1.2 of TLS 1.3 [RFC8446].
The extension 'client_certificate_type' sent in the client hello MAY
carry a list of supported certificate types, sorted by client
preference. It is a list in the case where the client supports
multiple certificate types.
Client MAY respond along with supported certificate by sending a
"Certificate" message immediately followed by the "CetificateVerify"
message.
4.2. Server Hello
When the server receives the client hello containing the
client_certificate_type extension and/or the server_certificate_type
extension. The following outcomes are possible:
- The server supports the extension described in this document.
It selects a certificate type from the client_certificate_type
field in the extended Client Hello and must take into account the
client authentication list priority.
- The server does not support the proposed certificate type and
terminates the session with a fatal alert of type
"unsupported_certificate".
5. Certificate Verification
5.1. IEEE 1609.2 certificates
Verification of an IEEE 1609.2 certificate or certificate chain is
described in section 5.5.2 of [IEEE1609.2].
5.2. ETSI TS 103 097 certificates
Verification of ETSI TS 103 097 certificate or certificate chain is
described in [TS103097].
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6. Examples
Some of exchanged messages examples are illustrated in Figures 2 and
3.
6.1. TLS Server and TLS Client use the 1609Dot2 Certificate
This section shows an example where the TLS client as well as the TLS
server use the IEEE 1609.2 certificate. In consequence, both the
server and the client populate the client_certificate_type and
server_certificate_type with extension IEEE 1609.2 certificates as
mentioned in figure 2.
Client Server
ClientHello,
client_certificate_type*=1609Dot2,
server_certificate_type*=1609Dot2, --------> ServerHello,
{EncryptedExtensions}
{client_certificate_type*=1609Dot2}
{server_certificate_type*=1609Dot2}
{CertificateRequest*}
{Certificate*}
{CertificateVerify*}
{Finished}
{Certificate*} <------- [Application Data*]
{CertificateVerify*}
{Finished} -------->
[Application Data] <-------> [Application Data]
Figure 2: TLS Client and TLS Server use the IEEE 1609.2 certificate
6.2. TLS Server uses the IEEE 1609.2 certificate and TLS Client uses
the X 509 certificate
This example shows the TLS authentication, where the TLS client
indicates its ability to receive and to validate an IEEE 1609.2
certificate from the server. Therefore, the client populates the
server_certificate_type extension with the IEEE 1609.2 certificate
type as presented in figure 3.
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Client Server
ClientHello,
client_certificate_type*=(X.509),
server_certificate_type*=(1609Dot2), -------> ServerHello,
{EncryptedExtensions}
{client_certificate_type*=X.509}
{server_certificate_type*=1609Dot2}
{Certificate*}
{CertificateVerify*}
{Finished}
<--------- [Application Data*]
{Finished} --------->
[Application Data] <--------> [Application Data]
Figure 3: TLS Server uses the IEEE 1609.2 certificate and TLS Client
uses the X 509 certificate
6.3. TLS Server uses the IEEE 1609.2 certificate and TLS Client uses
the ETSI TS 103097 certificate
This section shows an example combining an IEEE 1609.2 certificate
and an ETSI TS 103097 certificate. The client uses the ETSI TS
103097 certificate for client authentication, and the server provides
an IEEE 1609.2 certificate. This exchange starts with the client
indicating its ability to process an IEEE 1609.2 certificate if
provided by the server. For client authentication, the server
indicates that it has selected the ETSI TS 103097 format and requests
the certificate from the client as presented in figure 4.
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Client Server
ClientHello,
client_certificate_type*=(103097),
server_certificate_type*=(1609Dot2), -------> ServerHello,
{EncryptedExtensions}
{client_certificate_type*=103097}
{server_certificate_type*=1609Dot2}
{Certificate*}
{CertificateVerify*}
{Finished}
<--------- [Application Data*]
{Finished} --------->
[Application Data] <--------> [Application Data]
Figure 4: TLS Server uses the IEEE 1609.2 certificate and TLS Client
uses the ETSI TS 103097 certificate
7. Security Considerations
This section provides an overview of the basic security
considerations which need to be taken into account before
implementing the necessary security mechanisms. The security
considerations described throughout [RFC8446] apply here as well.
For security considerations in a vehicular environment, the minimal
use of any TLS extensions is recommended such as :
o The "client_certificate_type" [IANA value 19] extension who's
purpose was previously described in [RFC7250].
o The "server_certificate_type" [IANA value 20] extension who's
purpose was previously described in [RFC7250].
o The "SessionTicket" [IANA value 35] extension for session
resumption.
8. Privacy Considerations
For privacy considerations in a vehicular environment the use of ETSI
TS 103097 and IEEE 1609.2 certificates is recommended for many
reasons:
In order to address the risk of a personal data leakage, messages
exchanged for V2V communications are signed using IEEE 1609.2 and
ETSI TS 103097 pseudonym certificates
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The purpose of these certificates is to provide privacy relying on
geographical and/or temporal validity criteria, and minimizing the
exchange of private data
9. IANA Considerations
Existing IANA references have not been updated yet to point to this
document.
IANA is asked to register two new values in the "TLS Certificate
Types" registry of Transport Layer Security (TLS) Extensions [TLS-
Certificate-Types-Registry], as follows:
o Value: TBD Description: 1609Dot2 Reference: [THIS RFC]
o Value: TBD Description: 103097 Reference: [THIS RFC]
10. Acknowledgements
This document borrows a lot from
[draft-serhrouchni-tls-certieee1609-00]. The authors wish to thank
Eric Rescola and Ilari Liusvaara and William Whyte for their feedback
and suggestions on improving this document. Thanks are due to Sean
Turner for his valuable and detailed comments.
11. References
11.1. Normative References
[IEEE1609.2]
IEEE, "IEEE Standard for Wireless Access in Vehicular
Environments - Security Services for Applications and
Management Messages", 2016.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", March 1997.
[RFC4492] Blake-Wilson, S., Bolyard, N., Gupta, V., Hawk, C., and B.
Moeller, "Elliptic Curve Cryptography (ECC) Cipher Suites
for Transport Layer Security (TLS)", May 2006.
[RFC5246] Dierks, T. and E. Rescorla, "The Transport Layer Security
(TLS) Protocol Version 1.2", August 2008.
[RFC5746] Rescorla, E., Ray, M., Dispensa, S., and N. Oskov,
"Transport Layer Security (TLS) Renegotiation Indication
Extension"", February 2010.
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[RFC7250] Wouters, P., Tschofenig, H., Weiler, S., and T. Kivinen,
"Using Raw Public Keys in Transport Layer Security (TLS)
and Datagram Transport Layer Security (DTLS)", June 2014.
[RFC8446] Rescorla, E., "The Transport Layer Security (TLS) Protocol
Version 1.3", August 2018.
[TS103097]
ETSI, "ETSI TS 103 097 v1.3.1 (2017-10): Intelligent
Transport Systems (ITS); Security; Security header and
certificate formats", October 2017.
11.2. Informative References
[draft-serhrouchni-tls-certieee1609-00]
KAISER, A., LABIOD, H., LONC, B., MSAHLI, M., and A.
SERHROUCHNI, "Transport Layer Security (TLS)
Authentication using ITS ETSI and IEEE certificates",
august 2017.
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Appendix A. Co-Authors
o Nancy Cam-Winget
CISCO, USA
[email protected]
o Maik Seewald
CISCO, USA
[email protected]
o Houda Labiod
Telecom Paristech, France
[email protected]
o Ahmed Serhrouchni
Telecom ParisTech
[email protected]
Authors' Addresses
Panos Kampanakis (editor)
Cisco
USA
EMail: EMail: [email protected]
Mounira Msahli (editor)
Telecom ParisTech
France
EMail: [email protected]
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