Network Working Group M. Richardson Internet-Draft SSW Expires: August 30, 2007 February 26, 2007 An interface between applications and keying systems draft-ietf-btns-c-api-00.txt Status of this Memo By submitting this Internet-Draft, each author represents that any applicable patent or other IPR claims of which he or she is aware have been or will be disclosed, and any of which he or she becomes aware will be disclosed, in accordance with Section 6 of BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet- Drafts. 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." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt. The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. This Internet-Draft will expire on August 30, 2007. Copyright Notice Copyright (C) The IETF Trust (2007). Richardson Expires August 30, 2007 [Page 1] Internet-Draft ipsp-c-api February 2007 Abstract Abstract Table of Contents 1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 4 3. Objects involved . . . . . . . . . . . . . . . . . . . . . . 5 3.1. Scope of Protection Token . . . . . . . . . . . . . . . . . 5 3.2. Scope of Identity Token . . . . . . . . . . . . . . . . . . 5 3.3. Validity period of Protection Token . . . . . . . . . . . . 5 3.4. Validity period of Identity Token . . . . . . . . . . . . . 6 4. Namespace . . . . . . . . . . . . . . . . . . . . . . . . . 7 5. pToken discovery . . . . . . . . . . . . . . . . . . . . . . 8 6. Accessor Functions . . . . . . . . . . . . . . . . . . . . . 9 7. Security Considerations . . . . . . . . . . . . . . . . . . 10 8. IANA Considerations . . . . . . . . . . . . . . . . . . . . 11 9. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . 12 10. References . . . . . . . . . . . . . . . . . . . . . . . . . 13 10.1. Normative references . . . . . . . . . . . . . . . . . . . . 13 10.2. Non-normative references . . . . . . . . . . . . . . . . . . 13 Author's Address . . . . . . . . . . . . . . . . . . . . . . 14 Intellectual Property and Copyright Statements . . . . . . . 15 Richardson Expires August 30, 2007 [Page 2] Internet-Draft ipsp-c-api February 2007 1. Overview 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 [RFC2119]. Richardson Expires August 30, 2007 [Page 3] Internet-Draft ipsp-c-api February 2007 2. Introduction Purpose of this API. Richardson Expires August 30, 2007 [Page 4] Internet-Draft ipsp-c-api February 2007 3. Objects involved There are two major kinds of objects that are defined by this document. These are the Protection Token (pToken) and the Identity Token (iToken). Both objects are abstracted into unique opaque tokens which may be manipulated only indirectly by applications. Each object has a series of attributes associated with it. The API provides a mechanism to query the value of attributes of the token. The attributes are where all of the content of the objects are. Each token has a scope - the place and time in which it can be considered valid. There are many conflicting qualities that one would wish for the token, and the result is a different compromise among these qualities for each token type. The tokens should be: small easy to allocate and deallocate automatically cleaned up when an application terminates (both properly and inproperly) easily compared easily passed back in a recvmsg(2) call as auxiliary data (for pToken) 3.1. Scope of Protection Token The protection token has a per-process (i.e. per-address space) scope. The scope of the token is not related to the underlying protection provided by IPsec. The token is a handle. 3.2. Scope of Identity Token The identity token has a per-system scope, although two applications running on the same system may not be able to compare it literally. 3.3. Validity period of Protection Token The pToken is valid only within the scope of a single process. The token may not be saved in any long term storage. It is permitted for one protection token to be replaced with another (equivalent) protection token due to a node moving, suspending and resuming, or due to extended network outages, however the underlying identity token would be guaranteed to be the same. This would most Richardson Expires August 30, 2007 [Page 5] Internet-Draft ipsp-c-api February 2007 likely occur with unconnected sockets, where due to the outage/ downtime, the keying system was unable to maintain a keying channel, and had to re-create the keys from scratch. 3.4. Validity period of Identity Token The iToken may be valid across the entire system, although it may need to be turned into an external representation. Some forms of identity token may be valid across systems, but in general an identity token is only valid in reference to a local set of trust anchors. (See [RFC2692]). Richardson Expires August 30, 2007 [Page 6] Internet-Draft ipsp-c-api February 2007 4. Namespace All functions and macros defined by this API are prefixed with "ipsec_" for functions and variables, and with "IPSEC_" if they are macros or enumerated types. (cf. to appropriate POSIX section?) Whenever sensible, the enumerated values defined in [RFC2367] are used if appropriate. Richardson Expires August 30, 2007 [Page 7] Internet-Draft ipsp-c-api February 2007 5. pToken discovery An application that receives a connection using accept(2), or with recvmsg(2) needs to get a protection token that is associated with the socket. For connected sockets (such as TCP and some SCTP modes), the protection token should not change during the lifetime of the socket, so a simple process is appropriate. For unconnected sockets (such as UDP and some SCTP modes), each datagram received may be received may arrive from a different source, and therefore may have different protections applied. A protection token needs to be returned with each datagram, so it must be returned as ancilliary data with recvmsg(2). For connected sockets, the pToken will not change during the connection. (see notes about rekeying). A simple function is provided to return a pToken from a file descriptor. Many implementions are likely to implement this using getsockopt(2), but an interface in those terms is not specified in order to keep it somewhat abstract. Richardson Expires August 30, 2007 [Page 8] Internet-Draft ipsp-c-api February 2007 6. Accessor Functions Richardson Expires August 30, 2007 [Page 9] Internet-Draft ipsp-c-api February 2007 7. Security Considerations stuff Richardson Expires August 30, 2007 [Page 10] Internet-Draft ipsp-c-api February 2007 8. IANA Considerations stuff Richardson Expires August 30, 2007 [Page 11] Internet-Draft ipsp-c-api February 2007 9. Acknowledgments stuff Richardson Expires August 30, 2007 [Page 12] Internet-Draft ipsp-c-api February 2007 10. References 10.1. Normative references [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC2367] McDonald, D., Metz, C., and B. Phan, "PF_KEY Key Management API, Version 2", RFC 2367, July 1998. [RFC2692] Ellison, C., "SPKI Requirements", RFC 2692, September 1999. 10.2. Non-normative references [RFC4301] Kent, S. and K. Seo, "Security Architecture for the Internet Protocol", RFC 4301, December 2005. Richardson Expires August 30, 2007 [Page 13] Internet-Draft ipsp-c-api February 2007 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/ Richardson Expires August 30, 2007 [Page 14] Internet-Draft ipsp-c-api February 2007 Full Copyright Statement Copyright (C) The IETF Trust (2007). 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The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary rights that may cover technology that may be required to implement this standard. Please address the information to the IETF at ietf-ipr@ietf.org. Acknowledgment Funding for the RFC Editor function is provided by the IETF Administrative Support Activity (IASA). Richardson Expires August 30, 2007 [Page 15]