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Run idnits with the --verbose option for more detailed information about the items above. -------------------------------------------------------------------------------- 2 NETWORK WORKING GROUP N. Williams 3 Internet-Draft Sun 4 Expires: April 19, 2006 October 16, 2005 6 GSS-API Domain-Based Service Names and Name Type 7 draft-ietf-kitten-gssapi-domain-based-names-01.txt 9 Status of this Memo 11 By submitting this Internet-Draft, each author represents that any 12 applicable patent or other IPR claims of which he or she is aware 13 have been or will be disclosed, and any of which he or she becomes 14 aware will be disclosed, in accordance with Section 6 of BCP 79. 16 Internet-Drafts are working documents of the Internet Engineering 17 Task Force (IETF), its areas, and its working groups. Note that 18 other groups may also distribute working documents as Internet- 19 Drafts. 21 Internet-Drafts are draft documents valid for a maximum of six months 22 and may be updated, replaced, or obsoleted by other documents at any 23 time. It is inappropriate to use Internet-Drafts as reference 24 material or to cite them other than as "work in progress." 26 The list of current Internet-Drafts can be accessed at 27 http://www.ietf.org/ietf/1id-abstracts.txt. 29 The list of Internet-Draft Shadow Directories can be accessed at 30 http://www.ietf.org/shadow.html. 32 This Internet-Draft will expire on April 19, 2006. 34 Copyright Notice 36 Copyright (C) The Internet Society (2005). 38 Abstract 40 This document describes domainname-based service principal names and 41 the corresponding name type for the Generic Security Service 42 Application Programming Interface (GSS-API). 44 Domain-based service names are similar to host-based service names, 45 but using a domain name (not necessarily and Internat domain name) 46 instead of or in addition to a hostname. The primary purpose of 47 domain-based service names is to provide a way to name clustered 48 services after the domain which they service, thereby allowing their 49 clients to authorize the service's servers based on authentication of 50 their names. 52 Table of Contents 54 1. Conventions used in this document . . . . . . . . . . . . . 3 55 2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 4 56 3. Name Type OID and Symbolic Name . . . . . . . . . . . . . . 5 57 4. Query and Display Syntaxes . . . . . . . . . . . . . . . . . 6 58 5. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . 7 59 6. Security Considerations . . . . . . . . . . . . . . . . . . 8 60 7. References . . . . . . . . . . . . . . . . . . . . . . . . . 9 61 7.1. Normative . . . . . . . . . . . . . . . . . . . . . . . . . 9 62 7.2. Informative . . . . . . . . . . . . . . . . . . . . . . . . 9 63 Author's Address . . . . . . . . . . . . . . . . . . . . . . 10 64 Intellectual Property and Copyright Statements . . . . . . . 11 66 1. Conventions used in this document 68 The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", 69 "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this 70 document are to be interpreted as described in [RFC2119]. 72 2. Introduction 74 The use of hostbased principal names for domain-wide services 75 presents the problem of how to distinguish between an instance of a 76 hostbased service that is authorized to respond for a domain and one 77 that isn't. 79 Consider LDAP. LDAP [RFC3377] with SASL [RFC2222] and the Kerberos V 80 mechanism [RFC1964] for the GSS-API [RFC2743] uses a hostbased 81 principal with a service name of "ldap", a reasonable approach, 82 provided there is only one logical LDAP directory in a Kerberos 83 realm's domain, and that all ldap servers in that realm serve that 84 one LDAP directory. If there were other LDAP directories, then 85 clients could not tell which service is authorized to serve which 86 directory, not without assuming a secure method for finding LDAP 87 servers (e.g., DNSSEC). This is a significant, and oft-unstated 88 restriction on users of LDAP. 90 Domain based names can eliminate this problem by allowing LDAP 91 service names to indicate which LDAP directory they are authorized to 92 serve. 94 A domain-based name consists of three required elements: 96 o a service name 98 o a domain name 100 o a hostname 102 3. Name Type OID and Symbolic Name 104 The new name type has an OID of 106 [NOTE: OID assignment to be made with IANA.] 108 {iso(1) org(3) dod(6) internet(1) security(5) nametypes(6) gss- 109 domain-based(5)} 111 The recommended symbolic name for this GSS-API name type is 112 "GSS_C_NT_DOMAINBASED_SERVICE". 114 4. Query and Display Syntaxes 116 There is a single name syntax for domain-based names. 118 The syntax is: 120 domain-based-name := 122 | '@' '@' 124 Note that for Internet domain names the trailing '.' is not and MUST 125 NOT be included in the domain name (or hostname) parts of the display 126 form GSS-API domain-based MNs. 128 5. Examples 130 o ldap@example.tld@ds1.example.tld 132 o kadmin@example.tld@kdc1.example.tld 134 6. Security Considerations 136 Use of GSS-API domain-based names may not be negotiable by some GSS- 137 API mechanisms, and some acceptors may not support GSS-API domain- 138 based names. In such cases initiators are left to fallback on the 139 use of hostbased names, in which case the initiators MUST also verify 140 that the acceptor's hostbased name is authorized to provide the given 141 service for the domain that the initiator had wanted. 143 The above security consideration also applies to all GSS-API 144 initiators who lack support for domain-based service names. 146 7. References 148 7.1. Normative 150 [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate 151 Requirement Levels", BCP 14, RFC 2119, March 1997. 153 [RFC2743] Linn, J., "Generic Security Service Application Program 154 Interface Version 2, Update 1", RFC 2743, January 2000. 156 7.2. Informative 158 [RFC1964] Linn, J., "The Kerberos Version 5 GSS-API Mechanism", 159 RFC 1964, June 1996. 161 [RFC2222] Myers, J., "Simple Authentication and Security Layer 162 (SASL)", RFC 2222, October 1997. 164 [RFC3377] Hodges, J. and R. Morgan, "Lightweight Directory Access 165 Protocol (v3): Technical Specification", RFC 3377, 166 September 2002. 168 Author's Address 170 Nicolas Williams 171 Sun Microsystems 172 5300 Riata Trace Ct 173 Austin, TX 78727 174 US 176 Email: Nicolas.Williams@sun.com 178 Intellectual Property Statement 180 The IETF takes no position regarding the validity or scope of any 181 Intellectual Property Rights or other rights that might be claimed to 182 pertain to the implementation or use of the technology described in 183 this document or the extent to which any license under such rights 184 might or might not be available; nor does it represent that it has 185 made any independent effort to identify any such rights. Information 186 on the procedures with respect to rights in RFC documents can be 187 found in BCP 78 and BCP 79. 189 Copies of IPR disclosures made to the IETF Secretariat and any 190 assurances of licenses to be made available, or the result of an 191 attempt made to obtain a general license or permission for the use of 192 such proprietary rights by implementers or users of this 193 specification can be obtained from the IETF on-line IPR repository at 194 http://www.ietf.org/ipr. 196 The IETF invites any interested party to bring to its attention any 197 copyrights, patents or patent applications, or other proprietary 198 rights that may cover technology that may be required to implement 199 this standard. Please address the information to the IETF at 200 ietf-ipr@ietf.org. 202 Disclaimer of Validity 204 This document and the information contained herein are provided on an 205 "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS 206 OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET 207 ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED, 208 INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE 209 INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED 210 WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. 212 Copyright Statement 214 Copyright (C) The Internet Society (2005). This document is subject 215 to the rights, licenses and restrictions contained in BCP 78, and 216 except as set forth therein, the authors retain all their rights. 218 Acknowledgment 220 Funding for the RFC Editor function is currently provided by the 221 Internet Society.