IPSECKEY WG M. Richardson
Internet-Draft SSW
Expires: September 28, 2003 March 30, 2003
A method for storing IPsec keying material in DNS.
draft-ietf-ipseckey-rr-00.txt
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Copyright Notice
Copyright (C) The Internet Society (2003). All Rights Reserved.
Abstract
This document describes a new resource record for DNS. This record
may be used to store public keys for use in IPsec systems.
This record replaces the functionality of the sub-type #1 of the KEY
Resource Record, which has been proposed to be obsoleted by RFC3445
[9].
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Storage formats . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 IPSECKEY RDATA format . . . . . . . . . . . . . . . . . . . . 4
2.2 RDATA format - precedence . . . . . . . . . . . . . . . . . . 4
2.3 RDATA format - algorithm type . . . . . . . . . . . . . . . . 4
2.4 RDATA format - gateway . . . . . . . . . . . . . . . . . . . . 4
2.5 RDATA format - RSA public key . . . . . . . . . . . . . . . . 5
2.6 RDATA format - DSA public key . . . . . . . . . . . . . . . . 5
3. Presentation formats . . . . . . . . . . . . . . . . . . . . . 6
3.1 Representation of IPSECKEY RRs . . . . . . . . . . . . . . . . 6
3.2 Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4. Security Considerations . . . . . . . . . . . . . . . . . . . 8
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 9
6. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 10
Normative references . . . . . . . . . . . . . . . . . . . . . 11
Non-normative references . . . . . . . . . . . . . . . . . . . 12
Author's Address . . . . . . . . . . . . . . . . . . . . . . . 12
Full Copyright Statement . . . . . . . . . . . . . . . . . . . 13
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1. Introduction
1.1 Overview
The IPSECKEY resource record (RR) is used to publish a public key
that is to be associated with a Domain Name System (DNS) name. This
can be the public key of a host, network, or application (in the case
of per-port keying).
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 [5].
An IPSECKEY resource record SHOULD be authenticated DNSSEC resource
record.
It is expected that there will often be multiple IPSECKEY resource
records at the same terminal node. This will be due to the presence
of multiple gateways and the need to rollover keys.
This resource record is class independent.
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2. Storage formats
The type number for the IPSECKEY RR is TBD.
2.1 IPSECKEY RDATA format
The RDATA for an IPSECKEY RR consists of a precedence value, a public
key (and algorithm type), and an optional gateway address.
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| precedence | algorithm | gateway |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +
~ gateway ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| /
/ public key /
/ /
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-|
2.2 RDATA format - precedence
This is an 8-bit precedence for this record. This is interpreted in
the same way as the PREFERENCE field described in section 3.3.9 of
RFC1035 [2].
2.3 RDATA format - algorithm type
aThe algorithm type field indicates the type of key that is present
in the public key field. A positive number, larger than 0 identifies
an algorithm type. The following values, which have been previously
defined by IANA are useful (see RFC2535 [6]).
A value of 0 indicates that no key is present.
The following values defined by IANA are useful:
3 A DSA key is present, in the format defined in RFC2536 [7]
5 A RSA key is present, in the format defined in RFC3110 [8]
2.4 RDATA format - gateway
The gateway field indicates a gateway to which an IPsec tunnel may be
created in order to reach the entity holding this resource record.
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The gateway field is a normal wire-encoded domain name (section 3.3
of RFC1035 [2]).
If no gateway is to be represented, then a null domain name MUST be
present.
It is a simple fully qualified domain name (FQDN). IP version 4 and
IP version 6 addresses may be represented using the reverse name
format, from in-addr.arpa. and ip6.arpa.
For instance, the IP version 4 address 192.0.1.2 is represented as
the domain name 2.1.0.192.in-addr.arpa.
2.5 RDATA format - RSA public key
If the algorithm type has the value 5 then public key portion
contains an RSA public key, encoded as described in secion 2 of
RFC3110 [8].
RFC2065 limited the exponent and modulus to 2552 bits in length, and
RFC3110 to 4096 bits. No such limit is specified here for the
purposes of encoding and decoding.
The length in octets of the public exponent length is represented as
one octet if it is in the range of 1 to 255 and by a zero octet
followed by a two octet unsigned length if it is longer than 255
bytes. The public key modulus field is a multiprecision unsigned
integer. The length of the modulus can be determined from the
RDLENGTH and the preceding RDATA fields including the exponent.
Leading zero bytes are prohibited in the exponent and modulus.
2.6 RDATA format - DSA public key
If the algorithm type has the value 3, then public key portion
contains an DSA public key, encoded as described in RFC2536 [7].
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3. Presentation formats
3.1 Representation of IPSECKEY RRs
IPSECKEY RRs may appear as lines in a zone data master file. The
precedence, algorithm and gateway fields are REQUIRED. There base64
encoded public key block is OPTIONAL.
If no gateway is to be indicated, then the root (".") SHOULD be used.
3.2 Examples
An example of a node 192.2.0.38 that will accept IPsec tunnels on its
own behalf.
38.0.2.192.in-addr.arpa. 7200 IN IPSECKEY ( 10 5
38.0.2.192.in-addr.arpa.
AQOrXJxB56Q28iOO43Va36elIFFKc/QB2orIeL94BdC5X4idFQZjSpsZ
Th48wKVXUE9xjwUkwR4R4/+1vjNN7KFp9fcqa2OxgjsoGqCn+3OPR8La
9uyvZg0OBuSTj3qkbh/2HacAUJ7vqvjQ3W8Wj6sMXtTueR8NNcdSzJh1
49ch3zqfiXrxxna8+8UEDQaRR9KOPiSvXb2KjnuDan6hDKOT4qTZRRRC
MWwnNQ9zPIMNbLBp0rNcZ+ZGFg2ckWtWh5yhv1iXYLV2vmd9DB6d4Dv8
cW7scc3rPmDXpYR6APqPBRHlcbenfHCt+oCkEWse8OQhMM56KODIVQq3
fejrfi1H )
An example of a node, 192.2.0.38 that has published its key only.
38.0.2.192.in-addr.arpa. 7200 IN IPSECKEY ( 10 5
.
AQOrXJxB56Q28iOO43Va36elIFFKc/QB2orIeL94BdC5X4idFQZjSpsZ
Th48wKVXUE9xjwUkwR4R4/+1vjNN7KFp9fcqa2OxgjsoGqCn+3OPR8La
9uyvZg0OBuSTj3qkbh/2HacAUJ7vqvjQ3W8Wj6sMXtTueR8NNcdSzJh1
49ch3zqfiXrxxna8+8UEDQaRR9KOPiSvXb2KjnuDan6hDKOT4qTZRRRC
MWwnNQ9zPIMNbLBp0rNcZ+ZGFg2ckWtWh5yhv1iXYLV2vmd9DB6d4Dv8
cW7scc3rPmDXpYR6APqPBRHlcbenfHCt+oCkEWse8OQhMM56KODIVQq3
fejrfi1H )
An example of a node, 192.2.0.38 that has delegated authority to the
node 192.2.3.5.
38.0.2.192.in-addr.arpa. 7200 IN IPSECKEY ( 10 5
5.3.2.192.in-addr.arpa.
AQOrXJxB56Q28iOO43Va36elIFFKc/QB2orIeL94BdC5X4idFQZjSpsZ
Th48wKVXUE9xjwUkwR4R4/+1vjNN7KFp9fcqa2OxgjsoGqCn+3OPR8La
9uyvZg0OBuSTj3qkbh/2HacAUJ7vqvjQ3W8Wj6sMXtTueR8NNcdSzJh1
49ch3zqfiXrxxna8+8UEDQaRR9KOPiSvXb2KjnuDan6hDKOT4qTZRRRC
MWwnNQ9zPIMNbLBp0rNcZ+ZGFg2ckWtWh5yhv1iXYLV2vmd9DB6d4Dv8
cW7scc3rPmDXpYR6APqPBRHlcbenfHCt+oCkEWse8OQhMM56KODIVQq3
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fejrfi1H )
An example of a node, 192.1.0.38 that has delegated authority to the
node with the identity "mygateway.example.com".
38.0.2.192.in-addr.arpa. 7200 IN IPSECKEY ( 10 5
mygateway.example.com.
AQOrXJxB56Q28iOO43Va36elIFFKc/QB2orIeL94BdC5X4idFQZjSpsZ
Th48wKVXUE9xjwUkwR4R4/+1vjNN7KFp9fcqa2OxgjsoGqCn+3OPR8La
9uyvZg0OBuSTj3qkbh/2HacAUJ7vqvjQ3W8Wj6sMXtTueR8NNcdSzJh1
49ch3zqfiXrxxna8+8UEDQaRR9KOPiSvXb2KjnuDan6hDKOT4qTZRRRC
MWwnNQ9zPIMNbLBp0rNcZ+ZGFg2ckWtWh5yhv1iXYLV2vmd9DB6d4Dv8
cW7scc3rPmDXpYR6APqPBRHlcbenfHCt+oCkEWse8OQhMM56KODIVQq3
fejrfi1H )
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4. Security Considerations
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5. IANA Considerations
IANA is asked to assign a resource record type number from the normal
resource record number space.
The algorithm field does not require any IANA action, as it is
inherited from DNS KEY algorithm values.
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6. Acknowledgments
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Normative references
[1] Mockapetris, P., "Domain names - concepts and facilities", STD
13, RFC 1034, November 1987.
[2] Mockapetris, P., "Domain names - implementation and
specification", STD 13, RFC 1035, November 1987.
[3] Bradner, S., "The Internet Standards Process -- Revision 3", BCP
9, RFC 2026, October 1996.
[4] Eastlake, D. and C. Kaufman, "Domain Name System Security
Extensions", RFC 2065, January 1997.
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Non-normative references
[5] Bradner, S., "Key words for use in RFCs to Indicate Requirement
Levels", BCP 14, RFC 2119, March 1997.
[6] Eastlake, D., "Domain Name System Security Extensions", RFC
2535, March 1999.
[7] Eastlake, D., "DSA KEYs and SIGs in the Domain Name System
(DNS)", RFC 2536, March 1999.
[8] Eastlake, D., "RSA/SHA-1 SIGs and RSA KEYs in the Domain Name
System (DNS)", RFC 3110, May 2001.
[9] Massey, D. and S. Rose, "Limiting the Scope of the KEY Resource
Record (RR)", RFC 3445, December 2002.
Author's Address
Michael C. Richardson
Sandelman Software Works
470 Dawson Avenue
Ottawa, ON K1Z 5V7
CA
EMail: mcr@sandelman.ottawa.on.ca
URI: http://www.sandelman.ottawa.on.ca/
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