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Network Working Group N. Williams
Request for Comments: 5587 Sun
Category: Standards Track July 2009
Extended Generic Security Service Mechanism Inquiry APIs
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
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 possess given attributes, and a function
for displaying mechanism attributes.
Status of This Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
Copyright (c) 2009 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents in effect on the date of
publication of this document (http://trustee.ietf.org/license-info).
Please review these documents carefully, as they describe your rights
and restrictions with respect to this document.
Williams Standards Track [Page 1]
RFC 5587 Extended GSS Mech Inquiry July 2009
Table of Contents
1. Introduction ....................................................2
2. Conventions Used in This Document ...............................2
3. New GSS-API Interfaces ..........................................3
3.1. Mechanism Attributes and Attribute Sets ....................3
3.2. List of Known Mechanism Attributes .........................4
3.3. Mechanism Attribute Sets of Existing Mechs .................6
3.4. New GSS-API Function Interfaces ............................8
3.4.1. Mechanism Attribute Criticality .....................8
3.4.2. GSS_Indicate_mechs_by_attrs() .......................9
3.4.3. GSS_Inquire_attrs_for_mech() .......................10
3.4.4. GSS_Display_mech_attr() ............................10
3.4.5. New Major Status Values ............................11
3.4.6. C-Bindings .........................................11
4. Requirements for Mechanism Designers ...........................13
5. IANA Considerations ............................................13
6. Security Considerations ........................................13
7. References .....................................................13
7.1. Normative References ......................................13
7.2. Informative References ....................................14
Appendix A. Typedefs and C Bindings ..................................15
1. Introduction
GSS-API [RFC2743] mechanisms have a number of properties that may be
of interest to applications. The lack of APIs for inquiring about
available mechanisms' properties has meant that many GSS-API
applications must hardcode mechanism Object Identifiers (OIDs).
Ongoing work may result in a variety of new GSS-API mechanisms.
Applications should not have to hardcode their OIDs.
For example, the Secure Shell version 2 (SSHv2) protocol [RFC4251]
supports the use of GSS-API mechanisms for authentication [RFC4462]
but explicitly prohibits the use of Simple and Protected GSS-API
Negotiation (SPNEGO) [RFC4178]. Future mechanisms that negotiate
mechanisms would have to be forbidden as well, but there is no way to
implement applications that inquire what mechanisms are available and
then programmatically exclude mechanisms "like SPNEGO".
2. 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].
Williams Standards Track [Page 2]
RFC 5587 Extended GSS Mech Inquiry July 2009
3. New GSS-API Interfaces
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 without having to hardcode mechanism OIDs.
Section 3.1 describes the mechanism attributes concept. Sections
3.4.2, 3.4.3, and 3.4.4 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 mechanisms and pseudo-
mechanisms is needed in order to facilitate the programmatic
selection of mechanisms. Pseudo-mechanisms are mechanisms that make
reference to other mechanisms in order to provide their services.
For example, SPNEGO is a pseudo-mechanism, for without other
mechanisms SPNEGO is useless.
Two data types are needed: one for individual mechanism attributes
and one for mechanism attribute sets. To simplify the mechanism
attribute interfaces, we reuse the 'OID' and 'OID set' data types and
model individual mechanism attribute types as OIDs.
To this end, we define an open namespace of mechanism attributes and
assign them arcs off of this OID:
<1.3.6.1.5.5.13>
Each mechanism has a set of mechanism attributes that it supports as
described in its specification.
Williams Standards Track [Page 3]
RFC 5587 Extended GSS Mech Inquiry July 2009
3.2. List of Known Mechanism Attributes
+-------------------------+---------+-------------------------+
| Mech Attr Name | OID Arc | Arc Name |
+-------------------------+---------+-------------------------+
| GSS_C_MA_MECH_CONCRETE | (1) | concrete-mech |
| GSS_C_MA_MECH_PSEUDO | (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 |
| GSS_C_MA_WRAP | (20) | wrap |
| 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_PFS | (25) | pfs |
| GSS_C_MA_COMPRESS | (26) | compress |
| GSS_C_MA_CTX_TRANS | (27) | context-transfer |
| <reserved> | (28...) | |
+-------------------------+---------+-------------------------+
Table 1
Williams Standards Track [Page 4]
RFC 5587 Extended GSS Mech Inquiry July 2009
+-------------------------+-----------------------------------------+
| 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_PSEUDO | Indicates that a mech is a |
| | pseudo-mechanism. |
| GSS_C_MA_MECH_COMPOSITE | Indicates that a mech is a composite of |
| | other mechanisms. This is reserved for |
| | a specification of "stackable" |
| | pseudo-mechanisms. |
| 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 it |
| | is also known not to be the OID of any |
| | GSS-API mechanism (or of 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 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. "Initial authentication" |
| | refers to the use of passwords, or keys |
| | stored on tokens, for authentication. |
| | Whether a mechanism supports initial |
| | authentication may depend on IETF |
| | consensus (see Security |
| | Considerations). |
| GSS_C_MA_AUTH_TARG_INIT | Indicates support for initial |
| | authentication of acceptor to |
| | initiator. |
| GSS_C_MA_AUTH_INIT_ANON | Indicates support for |
| | GSS_C_NT_ANONYMOUS as an initiator |
| | principal name. |
Williams Standards Track [Page 5]
RFC 5587 Extended GSS Mech Inquiry July 2009
| GSS_C_MA_AUTH_TARG_ANON | Indicates support for |
| | GSS_C_NT_ANONYMOUS as a target |
| | principal name. |
| 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 Message Integrity |
| | Code (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_PFS | Indicates support for Perfect Forward |
| | Security. |
| 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
3.3. Mechanism Attribute Sets of Existing Mechs
The Kerberos V mechanism [RFC1964] 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
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RFC 5587 Extended GSS Mech Inquiry July 2009
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 that has the same
mechanism attributes as above as well as GSS_C_MA_DEPRECATED.
The mechanism attributes of the Simple Public-Key GSS-API Mechanism
(SPKM) [RFC2025] family of mechanisms will be provided in a separate
document, as SPKM is currently being reviewed for possibly
significant changes due to problems in its specifications.
The Low Infrastructure Public Key (LIPKEY) mechanism [RFC2847] offers
the following attributes:
o GSS_C_MA_MECH_CONCRETE
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
o GSS_C_MA_OOS_DET
o GSS_C_MA_CTX_TRANS (some implementations, using implementation-
specific exported context token formats)
Williams Standards Track [Page 7]
RFC 5587 Extended GSS Mech Inquiry July 2009
(LIPKEY should also provide GSS_C_MA_CBINDINGS, but SPKM-3
requires clarifications on this point.)
The SPNEGO mechanism [RFC4178] provides the following attributes:
o GSS_C_MA_MECH_NEGO
o GSS_C_MA_ITOK_FRAMED
All other mechanisms' attributes will be described elsewhere.
3.4. New GSS-API Function Interfaces
Several new interfaces are given by which, for example, GSS-API
applications may determine what features are provided by a given
mechanism and what mechanisms provide what features.
These new interfaces are all OPTIONAL.
Applications should use GSS_Indicate_mechs_by_attrs() instead of
GSS_Indicate_mechs() wherever possible.
Applications can use GSS_Indicate_mechs_by_attrs() to determine what,
if any, mechanisms provide a given set of features.
GSS_Indicate_mechs_by_attrs() can also be used to indicate (as in
GSS_Indicate_mechs()) the set of available mechanisms of each type
(concrete, mechanism negotiation pseudo-mechanism, etc.).
3.4.1. Mechanism Attribute Criticality
Mechanism attributes may be added at any time. Not only may
attributes be added to the list of known mechanism attributes at any
time, but the set of mechanism attributes supported by a mechanism
can be changed at any time.
For example, new attributes might be added to reflect whether a
mechanism's initiator must contact an online infrastructure and/or
whether the acceptor must do so. In this example, the Kerberos V
mechanism would gain a new attribute even though the mechanism itself
is not modified.
Applications making use of attributes not defined herein would then
have no way of knowing whether a GSS-API implementation and its
mechanisms know about new mechanism attributes. To address this
problem, GSS_Indicate_mechs_by_attrs() and
GSS_Inquire_attrs_for_mech() support a notion of critical mechanism
attributes. Applications can search for mechanisms that understand
Williams Standards Track [Page 8]
RFC 5587 Extended GSS Mech Inquiry July 2009
mechanism attributes that are critical to the application, and the
application may ask what mechanism attributes are understood by a
given mechanism.
3.4.2. GSS_Indicate_mechs_by_attrs()
Inputs:
o desired_mech_attrs SET OF OBJECT IDENTIFIER -- set of GSS_C_MA_*
OIDs that the mechanisms indicated in the mechs output parameter
MUST offer.
o except_mech_attrs SET OF OBJECT IDENTIFIER -- set of GSS_C_MA_*
OIDs that the mechanisms indicated in the mechs output parameter
MUST NOT offer.
o critical_mech_attrs SET OF OBJECT IDENTIFIER -- set of GSS_C_MA_*
OIDs that the mechanisms indicated in the mechs output parameter
MUST understand (i.e., mechs must know whether critical attributes
are or are not supported).
Outputs:
o major_status INTEGER
o minor_status INTEGER
o mechs SET OF OBJECT IDENTIFIER -- set of mechanisms that support
the given desired_mech_attrs but not the except_mech_attrs, and
all of which understand the given critical_mech_attrs (the caller
must release this output with GSS_Release_oid_set()).
Return major_status codes:
o GSS_S_COMPLETE indicates success; the output mechs parameter MAY
be the empty set (GSS_C_NO_OID_SET).
o GSS_S_FAILURE indicates that the request failed for some other
reason.
GSS_Indicate_mechs_by_attrs() returns the set of OIDs corresponding
to mechanisms that offer at least the desired_mech_attrs but none of
the except_mech_attrs, and that understand all of the attributes
listed in critical_mech_attrs.
When all three sets of OID input parameters are the empty set, this
function acts as a version of GSS_indicate_mechs() that outputs the
set of all supported mechanisms.
Williams Standards Track [Page 9]
RFC 5587 Extended GSS Mech Inquiry July 2009
3.4.3. GSS_Inquire_attrs_for_mech()
Inputs:
o mech OBJECT IDENTIFIER -- mechanism OID
Outputs:
o major_status INTEGER
o minor_status INTEGER
o mech_attrs SET OF OBJECT IDENTIFIER -- set of mech_attrs OIDs
(GSS_C_MA_*) supported by the mechanism (the caller must release
this output with GSS_Release_oid_set()).
o known_mech_attrs SET OF OBJECT IDENTIFIER -- set of mech_attrs
OIDs known to the mechanism implementation (the caller must
release this output with GSS_Release_oid_set()).
Return major_status codes:
o GSS_S_COMPLETE indicates success; the output mech_attrs parameter
MAY be the empty set (GSS_C_NO_OID_SET).
o GSS_S_BAD_MECH indicates that the mechanism named by the mech
parameter does not exist or that the mech is GSS_C_NO_OID and no
default mechanism could be determined.
o GSS_S_FAILURE indicates that the request failed for some other
reason.
GSS_Inquire_attrs_for_mech() indicates the set of mechanism
attributes supported by a given mechanism.
3.4.4. GSS_Display_mech_attr()
Inputs:
o mech_attr OBJECT IDENTIFIER -- mechanism attribute OID
Outputs:
o major_status INTEGER
o minor_status INTEGER
Williams Standards Track [Page 10]
RFC 5587 Extended GSS Mech Inquiry July 2009
o name OCTET STRING, -- name of mechanism attribute (e.g.,
GSS_C_MA_*).
o short_desc OCTET STRING, -- a short description of the mechanism
attribute (the caller must release this output with
GSS_Release_buffer()).
o long_desc OCTET STRING -- a longer description of the mechanism
attribute (the caller must release this output with
GSS_Release_buffer()).
Return major_status codes:
o GSS_S_COMPLETE indicates success.
o GSS_S_BAD_MECH_ATTR indicates that the mechanism attribute
referenced by the mech_attr parameter is unknown to the
implementation.
o GSS_S_FAILURE indicates that the request failed for some other
reason.
This function can be used to obtain human-readable descriptions of
GSS-API mechanism attributes.
3.4.5. New Major Status Values
A single, new, major status code is added for
GSS_Display_mech_attr():
o GSS_S_BAD_MECH_ATTR,
roughly corresponding to GSS_S_BAD_MECH but applicable to mechanism
attribute OIDs rather than to mechanism OIDs.
For the C-bindings of the GSS-API [RFC2744], GSS_S_BAD_MECH_ATTR
shall have a routine error number of 19 (this is shifted to the left
by GSS_C_ROUTINE_ERROR_OFFSET).
3.4.6. C-Bindings
Note that there is a bug in the C bindings of the GSS-APIv2u1
[RFC2744] in that the C 'const' attribute is applied to types that
are pointer typedefs. This is a bug because it declares that the
pointer argument is 'const' rather than that the object pointed by it
is const. To avoid this error, we hereby define new typedefs, which
include const properly:
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RFC 5587 Extended GSS Mech Inquiry July 2009
typedef const gss_buffer_desc * gss_const_buffer_t;
typedef const struct gss_channel_bindings_struct *
gss_const_channel_bindings_t;
typedef const <platform-specific> gss_const_ctx_id_t;
typedef const <platform-specific> gss_const_cred_id_t;
typedef const <platform-specific> gss_const_name_t;
typedef const gss_OID_desc * gss_const_OID;
typedef const gss_OID_set_desc * gss_const_OID_set;
Figure 1: const typedefs
Note that only gss_const_OID and gss_const_OID_set are used below.
We include the other const typedefs for convenience since the C
bindings of the GSS-API do use const with pointer typedefs when it
should often instead use the above typedefs instead.
#define GSS_S_BAD_MECH_ATTR (19ul << GSS_C_ROUTINE_ERROR_OFFSET)
OM_uint32 gss_indicate_mechs_by_attrs(
OM_uint32 *minor_status,
gss_const_OID_set desired_mech_attrs,
gss_const_OID_set except_mech_attrs,
gss_const_OID_set critical_mech_attrs,
gss_OID_set *mechs);
OM_uint32 gss_inquire_attrs_for_mech(
OM_uint32 *minor_status,
gss_const_OID mech,
gss_OID_set *mech_attrs,
gss_OID_set *known_mech_attrs);
OM_uint32 gss_display_mech_attr(
OM_uint32 *minor_status,
gss_const_OID mech_attr,
gss_buffer_t name,
gss_buffer_t short_desc,
gss_buffer_t long_desc);
Figure 2: C bindings
Note that output buffers must be released via gss_release_buffer().
Output OID sets must be released via gss_release_oid_set().
Please see Appendix A for a full set of typedef fragments defined in
this document and the necessary code license.
Williams Standards Track [Page 12]
RFC 5587 Extended GSS Mech Inquiry July 2009
4. Requirements for Mechanism Designers
All future GSS-API mechanism specifications MUST:
o list the set of GSS-API mechanism attributes associated with them.
5. IANA Considerations
The namespace of programming-language symbols with names beginning
with GSS_C_MA_* is reserved for allocation by IETF Consensus. IANA
allocated a base OID, as an arc of 1.3.6.1.5.5, for the set of
GSS_C_MA_* described herein, and registered all of the GSS_C_MA_*
values described in Section 3.2.
6. Security Considerations
This document specifies extensions to a security-related API. It
imposes new requirements on future GSS-API mechanisms, and the
specifications of future protocols that use the GSS-API should make
reference to this document where applicable. The ability to inquire
about specific properties of mechanisms should improve security.
The semantics of each mechanism attribute may include a security
component.
Application developers must understand that mechanism attributes may
be added at any time -- both to the set of known mechanism attributes
as well as to existing mechanisms' sets of supported mechanism
attributes. Therefore, application developers using the APIs
described herein must understand what mechanism attributes their
applications depend critically on, and must use the mechanism
attribute criticality features of these APIs.
7. References
7.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC2743] Linn, J., "Generic Security Service Application Program
Interface Version 2, Update 1", RFC 2743, January 2000.
[RFC2744] Wray, J., "Generic Security Service API Version 2 :
C-bindings", RFC 2744, January 2000.
Williams Standards Track [Page 13]
RFC 5587 Extended GSS Mech Inquiry July 2009
7.2. Informative References
[RFC1964] Linn, J., "The Kerberos Version 5 GSS-API Mechanism",
RFC 1964, June 1996.
[RFC2025] Adams, C., "The Simple Public-Key GSS-API Mechanism
(SPKM)", RFC 2025, October 1996.
[RFC2847] Eisler, M., "LIPKEY - A Low Infrastructure Public Key
Mechanism Using SPKM", RFC 2847, June 2000.
[RFC4178] Zhu, L., Leach, P., Jaganathan, K., and W. Ingersoll, "The
Simple and Protected Generic Security Service Application
Program Interface (GSS-API) Negotiation Mechanism",
RFC 4178, October 2005.
[RFC4251] Ylonen, T. and C. Lonvick, "The Secure Shell (SSH)
Protocol Architecture", RFC 4251, January 2006.
[RFC4462] Hutzelman, J., Salowey, J., Galbraith, J., and V. Welch,
"Generic Security Service Application Program Interface
(GSS-API) Authentication and Key Exchange for the Secure
Shell (SSH) Protocol", RFC 4462, May 2006.
Williams Standards Track [Page 14]
RFC 5587 Extended GSS Mech Inquiry July 2009
Appendix A. Typedefs and C Bindings
This appendix contains the full set of code fragments defined in this
document.
Copyright (c) 2009 IETF Trust and the persons identified as authors
of the code. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
- Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the
distribution.
- Neither the name of Internet Society, IETF or IETF Trust, nor the
names of specific contributors, may be used to endorse or promote
products derived from this software without specific prior written
permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
typedef const gss_buffer_desc * gss_const_buffer_t;
typedef const struct gss_channel_bindings_struct *
gss_const_channel_bindings_t;
typedef const <platform-specific> gss_const_ctx_id_t;
typedef const <platform-specific> gss_const_cred_id_t;
typedef const <platform-specific> gss_const_name_t;
typedef const gss_OID_desc * gss_const_OID;
typedef const gss_OID_set_desc * gss_const_OID_set;
Williams Standards Track [Page 15]
RFC 5587 Extended GSS Mech Inquiry July 2009
#define GSS_S_BAD_MECH_ATTR (19ul << GSS_C_ROUTINE_ERROR_OFFSET)
OM_uint32 gss_indicate_mechs_by_attrs(
OM_uint32 *minor_status,
gss_const_OID_set desired_mech_attrs,
gss_const_OID_set except_mech_attrs,
gss_const_OID_set critical_mech_attrs,
gss_OID_set *mechs);
OM_uint32 gss_inquire_attrs_for_mech(
OM_uint32 *minor_status,
gss_const_OID mech,
gss_OID_set *mech_attrs,
gss_OID_set *known_mech_attrs);
OM_uint32 gss_display_mech_attr(
OM_uint32 *minor_status,
gss_const_OID mech_attr,
gss_buffer_t name,
gss_buffer_t short_desc,
gss_buffer_t long_desc);
Author's Address
Nicolas Williams
Sun Microsystems
5300 Riata Trace Ct
Austin, TX 78727
US
EMail: Nicolas.Williams@sun.com
Williams Standards Track [Page 16]

1
lib/gssapi/Makefile.am
View File

@@ -111,6 +111,7 @@ mechsrc = \
mech/gss_inquire_names_for_mech.c \
mech/gss_krb5.c \
mech/gss_mech_switch.c \
mech/gss_mo.o \
mech/gss_names.c \
mech/gss_oid_equal.c \
mech/gss_oid_to_str.c \

62
lib/gssapi/gssapi/gssapi.h
View File

@@ -90,29 +90,35 @@ typedef uint32_t gss_uint32;
struct gss_name_t_desc_struct;
typedef struct gss_name_t_desc_struct *gss_name_t;
typedef const struct gss_name_t_desc_struct *gss_const_name_t;
struct gss_ctx_id_t_desc_struct;
typedef struct gss_ctx_id_t_desc_struct *gss_ctx_id_t;
typedef const struct gss_ctx_id_t_desc_struct gss_const_ctx_id_t;
typedef struct gss_OID_desc_struct {
OM_uint32 length;
void *elements;
} gss_OID_desc, *gss_OID;
typedef const gss_OID_desc * gss_const_OID;
typedef struct gss_OID_set_desc_struct {
size_t count;
gss_OID elements;
} gss_OID_set_desc, *gss_OID_set;
typedef const gss_OID_set_desc * gss_const_OID_set;
typedef int gss_cred_usage_t;
struct gss_cred_id_t_desc_struct;
typedef struct gss_cred_id_t_desc_struct *gss_cred_id_t;
typedef const struct gss_cred_id_t_desc_struct *gss_const_cred_id_t;
typedef struct gss_buffer_desc_struct {
size_t length;
void *value;
} gss_buffer_desc, *gss_buffer_t;
typedef const gss_buffer_desc * gss_const_buffer_t;
typedef struct gss_channel_bindings_struct {
OM_uint32 initiator_addrtype;
@@ -121,6 +127,7 @@ typedef struct gss_channel_bindings_struct {
gss_buffer_desc acceptor_address;
gss_buffer_desc application_data;
} *gss_channel_bindings_t;
typedef const struct gss_channel_bindings_struct *gss_const_channel_bindings_t;
/* GGF extension data types */
typedef struct gss_buffer_set_desc_struct {
@@ -138,6 +145,8 @@ typedef struct gss_iov_buffer_desc_struct {
*/
typedef OM_uint32 gss_qop_t;
/*
* Flag bits for context-level services.
*/
@@ -438,6 +447,7 @@ extern gss_OID_desc GSSAPI_LIB_VARIABLE __gss_sasl_digest_md5_mechanism_oid_desc
#define GSS_S_UNAVAILABLE (16ul << GSS_C_ROUTINE_ERROR_OFFSET)
#define GSS_S_DUPLICATE_ELEMENT (17ul << GSS_C_ROUTINE_ERROR_OFFSET)
#define GSS_S_NAME_NOT_MN (18ul << GSS_C_ROUTINE_ERROR_OFFSET)
#define GSS_S_BAD_MECH_ATTR (19ul << GSS_C_ROUTINE_ERROR_OFFSET)
/*
* Supplementary info bits:
@@ -929,6 +939,58 @@ gss_import_cred(OM_uint32 * /* minor_status */,
gss_buffer_t /* cred_token */,
gss_cred_id_t * /* cred_handle */);
/*
* mech option
*/
GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
gss_mo_set(gss_OID mech, gss_OID option, int enable, gss_buffer_t value);
GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
gss_mo_get(gss_OID mech, gss_OID option, gss_buffer_t value);
GSSAPI_LIB_FUNCTION void GSSAPI_LIB_CALL
gss_mo_list(gss_OID mech, gss_OID_set *options);
GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
gss_mo_name(gss_OID mech, gss_OID options, gss_buffer_t name);
/*
* SASL glue functions and mech inquire
*/
GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
gss_inquire_saslname_for_mech(OM_uint32 *minor_status,
const gss_OID desired_mech,
gss_buffer_t sasl_mech_name,
gss_buffer_t mech_name,
gss_buffer_t mech_description);
GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
gss_inquire_mech_for_saslname(OM_uint32 *minor_status,
const gss_buffer_t sasl_mech_name,
gss_OID *mech_type);
GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
gss_indicate_mechs_by_attrs(OM_uint32 * minor_status,
gss_const_OID_set desired_mech_attrs,
gss_const_OID_set except_mech_attrs,
gss_const_OID_set critical_mech_attrs,
gss_OID_set mechs);
GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
gss_inquire_attrs_for_mech(OM_uint32 * minor_status,
gss_const_OID mech,
gss_OID_set *mech_attr,
gss_OID_set *known_mech_attrs);
GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
gss_display_mech_attr(OM_uint32 * minor_status,
gss_const_OID mech_attr,
gss_buffer_t name,
gss_buffer_t short_desc,
gss_buffer_t long_desc);
GSSAPI_CPP_END

65
lib/gssapi/gssapi_mech.h
View File

@@ -354,7 +354,61 @@ _gss_import_cred_t(OM_uint32 * minor_status,
gss_cred_id_t * cred_handle);
#define GMI_VERSION 2
typedef OM_uint32
_gss_acquire_cred_ex_t(void * /* status */,
const gss_name_t /* desired_name */,
OM_uint32 /* flags */,
OM_uint32 /* time_req */,
gss_cred_usage_t /* cred_usage */,
void * /* identity */,
void * /* ctx */,
void (* /*complete */)(void *, OM_uint32, void *, gss_cred_id_t, OM_uint32));
typedef void
_gss_iter_creds_t(OM_uint32 /* flags */,
void * /* userctx */,
void (* /*cred_iter */ )(void *, gss_OID, gss_cred_id_t));
typedef OM_uint32
_gss_destroy_cred_t(OM_uint32 * /* minor_status */,
gss_cred_id_t */* cred */);
typedef OM_uint32
_gss_cred_hold_t(OM_uint32 * /* minor_status */,
gss_cred_id_t /* cred */);
typedef OM_uint32
_gss_cred_unhold_t(OM_uint32 * /* minor_status */,
gss_cred_id_t /* cred */);
typedef OM_uint32
_gss_cred_label_set_t(OM_uint32 * /* minor_status */,
gss_cred_id_t /* cred */,
const char * /* label */,
gss_buffer_t /* value */);
typedef OM_uint32
_gss_cred_label_get_t(OM_uint32 * /* minor_status */,
gss_cred_id_t /* cred */,
const char * /* label */,
gss_buffer_t /* value */);
typedef struct gss_mo_desc_struct gss_mo_desc;
struct gss_mo_desc_struct {
gss_OID option;
const char *name;
void *ctx;
int (*get)(gss_OID, gss_mo_desc *, gss_buffer_t);
int (*set)(gss_OID, gss_mo_desc *, int, gss_buffer_t);
OM_uint32 flags;
#define GSS_MO_IS_MA 1
#define GSS_MO_MA_CRITIAL 2
const char *description;
};
#define GMI_VERSION 4
/* gm_flags */
#define GM_USE_MG_CRED 1 /* uses mech glue credentials */
@@ -405,6 +459,15 @@ typedef struct gssapi_mech_interface_desc {
_gss_store_cred_t *gm_store_cred;
_gss_export_cred_t *gm_export_cred;
_gss_import_cred_t *gm_import_cred;
_gss_acquire_cred_ex_t *gm_acquire_cred_ex;
_gss_iter_creds_t *gm_iter_creds;
_gss_destroy_cred_t *gm_destroy_cred;
_gss_cred_hold_t *gm_cred_hold;
_gss_cred_unhold_t *gm_cred_unhold;
_gss_cred_label_get_t *gm_cred_label_get;
_gss_cred_label_set_t *gm_cred_label_set;
gss_mo_desc *gm_mo;
size_t gm_mo_num;
} gssapi_mech_interface_desc, *gssapi_mech_interface;
gssapi_mech_interface

197
lib/gssapi/mech/gss_mo.c Normal file
View File

@@ -0,0 +1,197 @@
/*
* Copyright (c) 2010 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Portions Copyright (c) 2010 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "mech_locl.h"
static int
get_option_def(int def, gss_OID mech, gss_mo_desc *mo, gss_buffer_t value)
{
return def;
}
int
_gss_mo_get_option_1(gss_OID mech, gss_mo_desc *mo, gss_buffer_t value)
{
return get_option_def(1, mech, mo, value);
}
int
_gss_mo_get_option_0(gss_OID mech, gss_mo_desc *mo, gss_buffer_t value)
{
return get_option_def(0, mech, mo, value);
}
int
gss_mo_set(gss_OID mech, gss_OID option, int enable, gss_buffer_t value)
{
gssapi_mech_interface m;
size_t n;
if ((m = __gss_get_mechanism(mech)) == NULL)
return GSS_S_BAD_MECH;
for (n = 0; n < m->gm_mo_num; n++)
if (gss_oid_equal(option, m->gm_mo[n].option) && m->gm_mo[n].set)
return m->gm_mo[n].set(mech, &m->gm_mo[n], enable, value);
return 0;
}
int
gss_mo_get(gss_OID mech, gss_OID option, gss_buffer_t value)
{
gssapi_mech_interface m;
size_t n;
if (value)
_mg_buffer_zero(value);
if ((m = __gss_get_mechanism(mech)) == NULL)
return 0;
for (n = 0; n < m->gm_mo_num; n++)
if (gss_oid_equal(option, m->gm_mo[n].option) && m->gm_mo[n].get)
return m->gm_mo[n].get(mech, &m->gm_mo[n], value);
return 0;
}
void
gss_mo_list(gss_OID mech, gss_OID_set *options)
{
gssapi_mech_interface m;
OM_uint32 major, minor;
size_t n;
if (options == NULL)
return;
*options = GSS_C_NO_OID_SET;
if ((m = __gss_get_mechanism(mech)) == NULL)
return;
major = gss_create_empty_oid_set(&minor, options);
if (major != GSS_S_COMPLETE)
return;
for (n = 0; n < m->gm_mo_num; n++)
gss_add_oid_set_member(&minor, m->gm_mo[n].option, options);
}
OM_uint32
gss_mo_name(gss_OID mech, gss_OID option, gss_buffer_t name)
{
gssapi_mech_interface m;
size_t n;
if (name == NULL)
return GSS_S_BAD_NAME;
if ((m = __gss_get_mechanism(mech)) == NULL)
return GSS_S_BAD_MECH;
for (n = 0; n < m->gm_mo_num; n++) {
if (gss_oid_equal(option, m->gm_mo[n].option)) {
name->value = strdup(m->gm_mo[n].name);
if (name->value == NULL)
return GSS_S_BAD_NAME;
name->length = strlen(m->gm_mo[n].name);
return GSS_S_COMPLETE;
}
}
return GSS_S_BAD_NAME;
}
GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
gss_inquire_saslname_for_mech(OM_uint32 *minor_status,
const gss_OID desired_mech,
gss_buffer_t sasl_mech_name,
gss_buffer_t mech_name,
gss_buffer_t mech_description)
{
_mg_buffer_zero(sasl_mech_name);
_mg_buffer_zero(mech_name);
_mg_buffer_zero(mech_description);
return GSS_S_COMPLETE;
}
GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
gss_inquire_mech_for_saslname(OM_uint32 *minor_status,
const gss_buffer_t sasl_mech_name,
gss_OID *mech_type)
{
*mech_type = NULL;
return GSS_S_COMPLETE;
}
GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
gss_indicate_mechs_by_attrs(OM_uint32 * minor_status,
gss_const_OID_set desired_mech_attrs,
gss_const_OID_set except_mech_attrs,
gss_const_OID_set critical_mech_attrs,
gss_OID_set mechs)
{
_mg_oid_set_zero(mechs);
return GSS_S_FAILURE;
}
GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
gss_inquire_attrs_for_mech(OM_uint32 * minor_status,
gss_const_OID mech,
gss_OID_set * mech_attr,
gss_OID_set *known_mech_attrs)
{
_mg_oid_set_zero(mech_attr);
_mg_oid_set_zero(known_mech_attrs);
return GSS_S_COMPLETE;
}
GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
gss_display_mech_attr(OM_uint32 * minor_status,
gss_const_OID mech_attr,
gss_buffer_t name,
gss_buffer_t short_desc,
gss_buffer_t long_desc)
{
_mg_buffer_zero(name);
_mg_buffer_zero(short_desc);
_mg_buffer_zero(long_desc);
return GSS_S_FAILURE;
}

3
lib/gssapi/mech/mech_locl.h
View File

@@ -65,3 +65,6 @@
#define _mg_buffer_zero(buffer) \
do { (buffer)->value = NULL; (buffer)->length = 0; } while(0)
#define _mg_oid_set_zero(oid_set) \
do { (oid_set)->elements = NULL; (oid_set)->length = 0; } while(0)