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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: July 27, 2008 January 24, 2008 6 GSS-API Domain-Based Service Names Mapping for the Kerberos V GSS 7 Mechanism 8 draft-ietf-kitten-krb5-gssapi-domain-based-names-05.txt 10 Status of this Memo 12 By submitting this Internet-Draft, each author represents that any 13 applicable patent or other IPR claims of which he or she is aware 14 have been or will be disclosed, and any of which he or she becomes 15 aware will be disclosed, in accordance with Section 6 of BCP 79. 17 Internet-Drafts are working documents of the Internet Engineering 18 Task Force (IETF), its areas, and its working groups. Note that 19 other groups may also distribute working documents as Internet- 20 Drafts. 22 Internet-Drafts are draft documents valid for a maximum of six months 23 and may be updated, replaced, or obsoleted by other documents at any 24 time. It is inappropriate to use Internet-Drafts as reference 25 material or to cite them other than as "work in progress." 27 The list of current Internet-Drafts can be accessed at 28 http://www.ietf.org/ietf/1id-abstracts.txt. 30 The list of Internet-Draft Shadow Directories can be accessed at 31 http://www.ietf.org/shadow.html. 33 This Internet-Draft will expire on July 27, 2008. 35 Copyright Notice 37 Copyright (C) The IETF Trust (2008). 39 Abstract 41 This document describes the mapping of GSS-API domainname-based 42 service principal names onto Kerberos V principal names. 44 Table of Contents 46 1. Conventions used in this document . . . . . . . . . . . . . . . 3 47 2. Domain-Based Names for the Kerberos V GSS-API Mechanism . . . . 3 48 3. Internationalization considerations . . . . . . . . . . . . . . 3 49 4. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 50 5. Security Considerations . . . . . . . . . . . . . . . . . . . . 4 51 6. Normative References . . . . . . . . . . . . . . . . . . . . . 4 52 Author's Address . . . . . . . . . . . . . . . . . . . . . . . 5 53 Intellectual Property and Copyright Statements . . . . . . . . 6 55 1. Conventions used in this document 57 The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", 58 "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this 59 document are to be interpreted as described in [RFC2119]. 61 2. Domain-Based Names for the Kerberos V GSS-API Mechanism 63 In accordance with [I-D.ietf-kitten-gssapi-domain-based-names] this 64 document provides the mechanism-specific details needed to implement 65 GSS-API [RFC2743] domain-based service names with the Kerberos V GSS- 66 API mechanism [RFC4121]. 68 GSS_C_NT_DOMAINBASED_SERVICE name SHOULD be mapped to Kerberos V 69 principal names as follows: 70 o the name becomes the first (0th) component of the 71 Kerberos V principal name; 72 o the becomes the second component of the Kerberos V 73 principal name; 74 o the name becomes the third component of the Kerberos V 75 principal name; 76 o the realm of the resulting principal name is that which 77 corresponds to the domain name, treated as a hostname. 79 The same name canonicalization considerations and methods as used 80 elsewhere in the Kerberos V GSS-API mechanism [RFC4121] and Kerberos 81 V [RFC4120] in general apply here. 83 Implementations SHOULD use a Kerberos V name-type of NT-SRV-HST- 84 DOMAIN (integral value to be assigned, possibly after WGLC?) but MAY 85 use NT-UNKNOWN instead. 87 3. Internationalization considerations 89 It is unclear, at this time, how best to address internationalization 90 of Kerberos V domain-based principal names. This is because the 91 Kerberos V core protocol internationalization project is incomplete. 93 However, clearly the best way to interoperate when using Kerberos V 94 domain-based principal names is to use ACE-encoded internationalized 95 domain names [RFC3490] for the hostname and domain name slots of a 96 Kerberos V domain-based principal name. Therefore Kerberos V GSS-API 97 mechanism implementations MUST do just that. 99 4. Examples 100 o The domain based name, of generic form, 101 "ldap@foo.example@ds1.foo.example" may map to a Kerberos V 102 principal name like: "ldap/ds1.foo.example/ 103 foo.example@FOO.EXAMPLE" 104 o The domain based name, of generic form, 105 "kadmin@foo.example@kdc1.foo.example" may map to a Kerberos V 106 principal name like: "kadmin/kdc1.foo.example/ 107 foo.example@FOO.EXAMPLE" 109 5. Security Considerations 111 See [I-D.ietf-kitten-gssapi-domain-based-names]. 113 It is important for the security of protocols using the Kerberos V 114 GSS-API mechanism and domain-based names, that the realm of domain- 115 based principal names be derived from the hostname, rather than the 116 domain name slots of the input domain-based name string. 118 6. Normative References 120 [I-D.ietf-kitten-gssapi-domain-based-names] 121 Williams, N. and A. Melnikov, "GSS-API 122 Internationalization and Domain-Based Service Names and 123 Name Type", draft-ietf-kitten-gssapi-domain-based-names-05 124 (work in progress), December 2007. 126 [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate 127 Requirement Levels", BCP 14, RFC 2119, March 1997. 129 [RFC2743] Linn, J., "Generic Security Service Application Program 130 Interface Version 2, Update 1", RFC 2743, January 2000. 132 [RFC3490] Faltstrom, P., Hoffman, P., and A. Costello, 133 "Internationalizing Domain Names in Applications (IDNA)", 134 RFC 3490, March 2003. 136 [RFC4120] Neuman, C., Yu, T., Hartman, S., and K. Raeburn, "The 137 Kerberos Network Authentication Service (V5)", RFC 4120, 138 July 2005. 140 [RFC4121] Zhu, L., Jaganathan, K., and S. Hartman, "The Kerberos 141 Version 5 Generic Security Service Application Program 142 Interface (GSS-API) Mechanism: Version 2", RFC 4121, 143 July 2005. 145 Author's Address 147 Nicolas Williams 148 Sun Microsystems 149 5300 Riata Trace Ct 150 Austin, TX 78727 151 US 153 Email: Nicolas.Williams@sun.com 155 Full Copyright Statement 157 Copyright (C) The IETF Trust (2008). 159 This document is subject to the rights, licenses and restrictions 160 contained in BCP 78, and except as set forth therein, the authors 161 retain all their rights. 163 This document and the information contained herein are provided on an 164 "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS 165 OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY, THE IETF TRUST AND 166 THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS 167 OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF 168 THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED 169 WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. 171 Intellectual Property 173 The IETF takes no position regarding the validity or scope of any 174 Intellectual Property Rights or other rights that might be claimed to 175 pertain to the implementation or use of the technology described in 176 this document or the extent to which any license under such rights 177 might or might not be available; nor does it represent that it has 178 made any independent effort to identify any such rights. Information 179 on the procedures with respect to rights in RFC documents can be 180 found in BCP 78 and BCP 79. 182 Copies of IPR disclosures made to the IETF Secretariat and any 183 assurances of licenses to be made available, or the result of an 184 attempt made to obtain a general license or permission for the use of 185 such proprietary rights by implementers or users of this 186 specification can be obtained from the IETF on-line IPR repository at 187 http://www.ietf.org/ipr. 189 The IETF invites any interested party to bring to its attention any 190 copyrights, patents or patent applications, or other proprietary 191 rights that may cover technology that may be required to implement 192 this standard. Please address the information to the IETF at 193 ietf-ipr@ietf.org. 195 Acknowledgment 197 Funding for the RFC Editor function is provided by the IETF 198 Administrative Support Activity (IASA).