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From: |
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Subject: |
CVS gss/doc/specification |
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Date: |
Tue, 15 Feb 2005 17:16:24 +0100 |
Update of /home/cvs/gss/doc/specification
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Added Files:
draft-ietf-kitten-extended-mech-inquiry-00.txt
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/home/cvs/gss/doc/specification/draft-ietf-kitten-extended-mech-inquiry-00.txt
2005/02/15 16:16:19 1.1
NETWORK WORKING GROUP N. Williams
Internet-Draft Sun
Expires: August 12, 2005 February 11, 2005
Extended Generic Security Service Mechanism Inquiry APIs
draft-ietf-kitten-extended-mech-inquiry-00.txt
Status of this Memo
By submitting this Internet-Draft, I certify that any applicable
patent or other IPR claims of which I am aware have been disclosed,
and any of which I become aware will be disclosed, in accordance with
RFC 3668.
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 12, 2005.
Copyright Notice
Copyright (C) The Internet Society (2005). All Rights Reserved.
Abstract
This document introduces new application programming interfaces
(APIs) to the Generic Security Services API (GSS-API) for extended
mechanism attribute inquiry. These interfaces are primarily intended
for use in mechanism composition, but also to reduce instances of
hardcoding of mechanism identifiers in GSS applications.
These interfaces include: mechanism attributes and attribute sets, a
function for inquiring the attributes of a mechanism, a function for
indicating mechanisms that posses given attributes, and a function
for displaying mechanism attributes.
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Table of Contents
1. Conventions used in this document . . . . . . . . . . . . . 3
2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
3. New GSS-API Interfaces . . . . . . . . . . . . . . . . . . . 3
3.1 Mechanism Attributes and Attribute Sets . . . . . . . . . . 3
3.2 Determination of Attribute Sets of Composite Mechs . . . . . 4
3.3 List of Known Mechanism Attributes . . . . . . . . . . . . . 4
3.4 Mechanism Attribute Sets of Existing Mechs . . . . . . . . . 7
3.5 New GSS-API Function Interfaces . . . . . . . . . . . . . . 8
3.5.1 GSS_Indicate_mechs_by_attr() . . . . . . . . . . . . . . . . 9
3.5.2 GSS_Inquire_attrs_for_mech() . . . . . . . . . . . . . . . . 9
3.5.3 GSS_Display_mech_attr() . . . . . . . . . . . . . . . . . . 10
3.5.4 New Major Status Values . . . . . . . . . . . . . . . . . . 10
3.5.5 C-Bindings . . . . . . . . . . . . . . . . . . . . . . . . . 11
4. Requirements for Mechanism Designers . . . . . . . . . . . . 11
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . 11
6. Security considerations . . . . . . . . . . . . . . . . . . 12
7. References . . . . . . . . . . . . . . . . . . . . . . . . . 12
7.1 Normative . . . . . . . . . . . . . . . . . . . . . . . . . 12
7.2 Normative . . . . . . . . . . . . . . . . . . . . . . . . . 12
Author's Address . . . . . . . . . . . . . . . . . . . . . . 12
Intellectual Property and Copyright Statements . . . . . . . 13
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1. Conventions used in this document
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].
2. Introduction
3. New GSS-API Interfaces
GSS-API applications face, today, the problem of how to select from
multiple GSS-API mechanisms that may be available. For example,
applications that support mechanism negotiation directly often have
to be careful not to use SPNEGO to avoid two-layer mechanism
negotiation, but since SPNEGO may be indicated by
GSS_Indicate_mechs() and since there's no way to know that a
mechanism negotiates mechanisms other than to hardcode the OIDs of
such mechanisms, such applications must hardcode the SPNEGO OID.
This problem is likely to be exacerbated by the introduction of
composite mechanisms.
To address this problem we introduce a new concept: that of mechanism
attributes. By allowing applications to query the set of attributes
associated with individual mechanisms and to find out which
mechanisms support a given set of attributes we allow applications to
select mechanisms based on their attributes yet without having to
hardcode mechanism OIDs.
Section 3.1 describes the mechanism attributes concept. Sections
3.5.1, 3.5.2 and 3.5.3 describe three new interfaces that deal in
mechanisms and attribute sets:
o GSS_Indicate_mechs_by_attrs()
o GSS_Inquire_attrs_for_mech()
o GSS_Display_mech_attr()
3.1 Mechanism Attributes and Attribute Sets
An abstraction for the features provided by pseudo-mechanisms is
needed in order to facilitate the programmatic selection of
mechanisms as well as for the programmatic composition of mechanisms.
Two data types are needed: one for individual mechanism attributes
and one for mechanism attribute sets. To simplify the mechanism
attributes interfaces we reuse the 'OID' and 'OID set' data types and
model individual mechanism attribute types as OIDs.
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To this end we define an open namespace of mechanism attributes and
assign them arcs off of this OID:
<TBD> [1.3.6.1.5.5.12 appears to be available, registration w/ IANA
TBD]
3.2 Determination of Attribute Sets of Composite Mechs
Each mechanism, composite or otherwise, has a set of mechanism
attributes that it supports as specified.
The mechanism attribute set of a composite mechanism is to be
determined by the top-most stackable pseudo-mechanism of the
composite according to its own attribute set and that of the
remainder of the composite mechanism stack below it.
It may well be that some composite mechanisms' attribute sets consist
of the union of those of their every component, however this need not
be the case and MUST NOT be assumed.
Every stackable pseudo-mechanism's specification MUST specify the
rules for determining the mechanism attribute set of mechanisms
composed by it.
3.3 List of Known Mechanism Attributes
+-------------------------+---------+--------------------------------+
| Mech Attr Name | OID Arc | Arc Name |
+-------------------------+---------+--------------------------------+
| GSS_C_MA_MECH_CONCRETE | (1) | concrete-mech |
| GSS_C_MA_MECH_STACKABLE | (2) | pseudo-mech |
| GSS_C_MA_MECH_COMPOSITE | (3) | composite-mech |
| GSS_C_MA_MECH_NEGO | (4) | mech-negotiation-mech |
| GSS_C_MA_MECH_GLUE | (5) | mech-glue |
| GSS_C_MA_NOT_MECH | (6) | not-mech |
| GSS_C_MA_DEPRECATED | (7) | mech-deprecated |
| GSS_C_MA_NOT_DFLT_MECH | (8) | mech-not-default |
| GSS_C_MA_ITOK_FRAMED | (9) | initial-is-framed |
| GSS_C_MA_AUTH_INIT | (10) | auth-init-princ |
| GSS_C_MA_AUTH_TARG | (11) | auth-targ-princ |
| GSS_C_MA_AUTH_INIT_INIT | (12) | auth-init-princ-initial |
| GSS_C_MA_AUTH_TARG_INIT | (13) | auth-targ-princ-initial |
| GSS_C_MA_AUTH_INIT_ANON | (14) | auth-init-princ-anon |
| GSS_C_MA_AUTH_TARG_ANON | (15) | auth-targ-princ-anon |
| GSS_C_MA_DELEG_CRED | (16) | deleg-cred |
| GSS_C_MA_INTEG_PROT | (17) | integ-prot |
| GSS_C_MA_CONF_PROT | (18) | conf-prot |
| GSS_C_MA_MIC | (19) | mic |
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| GSS_C_MA_WRAP | (20) | wap |
| GSS_C_MA_PROT_READY | (21) | prot-ready |
| GSS_C_MA_REPLAY_DET | (22) | replay-detection |
| GSS_C_MA_OOS_DET | (23) | oos-detection |
| GSS_C_MA_CBINDINGS | (24) | channel-bindings |
| GSS_C_MA_CBINDINGS_BIDI | (25) | channel-bindings-bidirectional |
| GSS_C_MA_CBINDINGS_NEGO | (26) | channel-bindings-negotiate |
| GSS_C_MA_PFS | (27) | pfs |
| GSS_C_MA_COMPRESS | (28) | compress |
| GSS_C_MA_CTX_TRANS | (29) | context-transfer |
| <reserved> | (30..) | |
+-------------------------+---------+--------------------------------+
Table 1
+---------------------------------+---------------------------------+
| Mech Attr Name | Purpose |
+---------------------------------+---------------------------------+
| GSS_C_MA_MECH_CONCRETE | Indicates that a mech is |
| | neither a pseudo- mechanism nor |
| | a composite mechanism. |
| GSS_C_MA_MECH_STACKABLE | Indicates that a mech is a |
| | pseudo-mechanism. |
| GSS_C_MA_MECH_COMPOSITE | Indicates that a mech is a |
| | composite mechanism. |
| GSS_C_MA_MECH_NEGO | Indicates that a mech |
| | negotiates other mechs (e.g., |
| | SPNEGO has this attribute). |
| GSS_C_MA_MECH_GLUE | Indicates that the OID is not |
| | for a mechanism but for the |
| | GSS-API itself. |
| GSS_C_MA_NOT_MECH | Indicates that the OID is |
| | known, yet also known not to be |
| | the OID of any GSS-API |
| | mechanism (or the GSS-API |
| | itself). |
| GSS_C_MA_DEPRECATED | Indicates that a mech (or its |
| | OID) is deprecated and MUST NOT |
| | be used as a default mechanism. |
| GSS_C_MA_NOT_DFLT_MECH | Indicates that a mech (or its |
| | OID) MUST NOT be used as a |
| | default mechanism. |
| GSS_C_MA_ITOK_FRAMED | Indicates that the given |
| | mechanism's initial context |
| | tokens are properly framed as |
| | per-section 3.1 of rfc2743. |
| GSS_C_MA_AUTH_INIT | Indicates support for |
| | authentication of initiator to |
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| | acceptor. |
| GSS_C_MA_AUTH_TARG | Indicates support for |
| | authentication of acceptor to |
| | initiator. |
| GSS_C_MA_AUTH_INIT_INIT | Indicates support for initial |
| | authentication of initiator to |
| | acceptor. |
| GSS_C_MA_AUTH_TARG_INIT | Indicates support for initial |
| | authentication of acceptor to |
| | initiator. |
| GSS_C_MA_AUTH_INIT_ANON | Indicates support for initiator |
| | anonymity. |
| GSS_C_MA_AUTH_TARG_ANON | Indicates support for acceptor |
| | anonymity. |
| GSS_C_MA_DELEG_CRED | Indicates support for |
| | credential delegation. |
| GSS_C_MA_INTEG_PROT | Indicates support for |
| | per-message integrity |
| | protection. |
| GSS_C_MA_CONF_PROT | Indicates support for |
| | per-message confidentiality |
| | protection. |
| GSS_C_MA_MIC | Indicates support for MIC |
| | tokens. |
| GSS_C_MA_WRAP | Indicates support for WRAP |
| | tokens. |
| GSS_C_MA_PROT_READY | Indicates support for |
| | per-message protection prior to |
| | full context establishment. |
| GSS_C_MA_REPLAY_DET | Indicates support for replay |
| | detection. |
| GSS_C_MA_OOS_DET | Indicates support for |
| | out-of-sequence detection. |
| GSS_C_MA_CBINDINGS | Indicates support for channel |
| | bindings. |
| GSS_C_MA_CBINDINGS_BIDI | Indicates that acceptors |
| | unconditionally indicate to |
| | initiators whether their |
| | channel bindings were matched |
| | the acceptors', even when the |
| | acceptor applications use |
| | GSS_C_NO_CHANNEL_BINDINGS.. |
| GSS_C_MA_CBINDINGS_NEGO | Indicates that the mech acts as |
| | a signal for application |
| | support for and willingness to |
| | use channel bindings. |
| GSS_C_MA_PFS | Indicates support for Perfect |
| | Forward Security. |
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| GSS_C_MA_COMPRESS | Indicates support for |
| | compression of data inputs to |
| | GSS_Wrap(). |
| GSS_C_MA_CTX_TRANS | Indicates support for security |
| | context export/import. |
+---------------------------------+---------------------------------+
Table 2
3.4 Mechanism Attribute Sets of Existing Mechs
The Kerberos V mechanism [RFC1964] [CFX] provides the following
mechanism attributes:
o GSS_C_MA_MECH_CONCRETE
o GSS_C_MA_ITOK_FRAMED
o GSS_C_MA_AUTH_INIT
o GSS_C_MA_AUTH_TARG
o GSS_C_MA_DELEG_CRED
o GSS_C_MA_INTEG_PROT
o GSS_C_MA_CONF_PROT
o GSS_C_MA_MIC
o GSS_C_MA_WRAP
o GSS_C_MA_PROT_READY
o GSS_C_MA_REPLAY_DET
o GSS_C_MA_OOS_DET
o GSS_C_MA_CBINDINGS
o GSS_C_MA_CTX_TRANS (some implementations, using
implementation-specific exported context token formats)
The Kerberos V mechanism also has a deprecated OID which has the same
mechanism attributes as above, and GSS_C_MA_DEPRECATED.
[The mechanism attributes of the SPKM family of mechanisms will be
provided in a separate document as SPKM is current being reviewed for
possibly significant changes due to problems in its specifications.]
The LIPKEY mechanism offers the following attributes:
o GSS_C_MA_MECH_CONCRETE (should be stackable, but does not compose)
o GSS_C_MA_ITOK_FRAMED
o GSS_C_MA_AUTH_INIT_INIT
o GSS_C_MA_AUTH_TARG (from SPKM-3)
o GSS_C_MA_AUTH_TARG_ANON (from SPKM-3)
o GSS_C_MA_INTEG_PROT
o GSS_C_MA_CONF_PROT
o GSS_C_MA_REPLAY_DET
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o GSS_C_MA_OOS_DET
o GSS_C_MA_CTX_TRANS (some implementations, using
implementation-specific exported context token formats)
(LIPKEY should also provide GSS_C_MA_CBINDINGS, but SPKM-3
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- CVS gss/doc/specification, gss-commit, 2005/02/02
- CVS gss/doc/specification,
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- CVS gss/doc/specification, gss-commit, 2005/02/16
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