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gss_acquire_cred

gss_acquire_cred

Section: gss (3) Updated: 1.0.1
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NAME

gss_acquire_cred - API function  

SYNOPSIS

#include <gss.h>

OM_uint32 gss_acquire_cred(OM_uint32 * minor_status, const gss_name_t desired_name, OM_uint32 time_req, const gss_OID_set desired_mechs, gss_cred_usage_t cred_usage, gss_cred_id_t * output_cred_handle, gss_OID_set * actual_mechs, OM_uint32 * time_rec);  

ARGUMENTS

OM_uint32 * minor_status
(integer, modify) Mechanism specific status code.
const gss_name_t desired_name
(gss_name_t, read) Name of principal whose
  credential should be acquired.
OM_uint32 time_req
(Integer, read, optional) Number of seconds that
  credentials should remain valid. Specify GSS_C_INDEFINITE to
  request that the credentials have the maximum permitted lifetime.
const gss_OID_set desired_mechs
(Set of Object IDs, read, optional) Set of
  underlying security mechanisms that may be used.
  GSS_C_NO_OID_SET may be used to obtain an implementation-specific
  default.
gss_cred_usage_t cred_usage
(gss_cred_usage_t, read) GSS_C_BOTH - Credentials may
  be used either to initiate or accept security contexts.
  GSS_C_INITIATE - Credentials will only be used to initiate
  security contexts.  GSS_C_ACCEPT - Credentials will only be used
  to accept security contexts.
gss_cred_id_t * output_cred_handle
(gss_cred_id_t, modify) The returned
  credential handle.  Resources associated with this credential
  handle must be released by the application after use with a call
  to gss_release_cred().
gss_OID_set * actual_mechs
(Set of Object IDs, modify, optional) The set of
  mechanisms for which the credential is valid.  Storage associated
  with the returned OID-set must be released by the application
  after use with a call to gss_release_oid_set().  Specify NULL if
  not required.
OM_uint32 * time_rec
(Integer, modify, optional) Actual number of seconds for
  which the returned credentials will remain valid.  If the
  implementation does not support expiration of credentials, the
  value GSS_C_INDEFINITE will be returned. Specify NULL if not
  required.
 

DESCRIPTION

Allows an application to acquire a handle for a pre-existing credential by name. GSS-API implementations must impose a local access-control policy on callers of this routine to prevent unauthorized callers from acquiring credentials to which they are not entitled. This routine is not intended to provide a "login to the network" function, as such a function would involve the creation of new credentials rather than merely acquiring a handle to existing credentials. Such functions, if required, should be defined in implementation-specific extensions to the API.

If desired_name is GSS_C_NO_NAME, the call is interpreted as a request for a credential handle that will invoke default behavior when passed to gss_init_sec_context() (if cred_usage is GSS_C_INITIATE or GSS_C_BOTH) or gss_accept_sec_context() (if cred_usage is GSS_C_ACCEPT or GSS_C_BOTH).

Mechanisms should honor the desired_mechs parameter, and return a credential that is suitable to use only with the requested mechanisms. An exception to this is the case where one underlying credential element can be shared by multiple mechanisms; in this case it is permissible for an implementation to indicate all mechanisms with which the credential element may be used. If desired_mechs is an empty set, behavior is undefined.

This routine is expected to be used primarily by context acceptors, since implementations are likely to provide mechanism-specific ways of obtaining GSS-API initiator credentials from the system login process. Some implementations may therefore not support the acquisition of GSS_C_INITIATE or GSS_C_BOTH credentials via gss_acquire_cred for any name other than GSS_C_NO_NAME, or a name produced by applying either gss_inquire_cred to a valid credential, or gss_inquire_context to an active context.

If credential acquisition is time-consuming for a mechanism, the mechanism may choose to delay the actual acquisition until the credential is required (e.g. by gss_init_sec_context or gss_accept_sec_context). Such mechanism-specific implementation decisions should be invisible to the calling application; thus a call of gss_inquire_cred immediately following the call of gss_acquire_cred must return valid credential data, and may therefore incur the overhead of a deferred credential acquisition.  

RETURN VALUE

`GSS_S_COMPLETE`: Successful completion.

`GSS_S_BAD_MECH`: Unavailable mechanism requested.

`GSS_S_BAD_NAMETYPE`: Type contained within desired_name parameter is not supported.

`GSS_S_BAD_NAME`: Value supplied for desired_name parameter is ill formed.

`GSS_S_CREDENTIALS_EXPIRED`: The credentials could not be acquired Because they have expired.

`GSS_S_NO_CRED`: No credentials were found for the specified name.  

REPORTING BUGS

Report bugs to <bug-gss@gnu.org>. GNU Generic Security Service home page: http://www.gnu.org/software/gss/ General help using GNU software: http://www.gnu.org/gethelp/  

COPYRIGHT

Copyright © 2003-2010 Simon Josefsson.
Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved.  

SEE ALSO

The full documentation for gss is maintained as a Texinfo manual. If the info and gss programs are properly installed at your site, the command
info gss

should give you access to the complete manual.


 

Index

NAME
SYNOPSIS
ARGUMENTS
DESCRIPTION
RETURN VALUE
REPORTING BUGS
COPYRIGHT
SEE ALSO

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Time: 21:47:33 GMT, April 16, 2011