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 © 2003-2013 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.