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Man Pages


Manual Reference Pages  -  GSS_ACQUIRE_CRED (3)

NAME

gss_acquire_cred - Obtain a GSS-API credential handle for pre-existing credentials

CONTENTS

Synopsis
Description
Parameters
Return Values
See Also
Standards
History
Authors
Copyright

SYNOPSIS


.In gssapi/gssapi.h OM_uint32
.Fo 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
.Fc

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.

PARAMETERS

desired_name Name of principal whose credential should be acquired.
time_req Number of seconds that credentials should remain valid. Specify GSS_C_INDEFINITE to request that the credentials have the maximum permitted lifetime.
desired_mechs Set of underlying security mechanisms that may be used. GSS_C_NO_OID_SET may be used to obtain an implementation-specific default.
cred_usage
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.
output_cred_handle
  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.
actual_mechs 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.
time_rec 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.
minor_status Mechanism specific status code.

RETURN VALUES

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.

SEE ALSO

gss_init_sec_context(3), gss_accept_sec_context(3), gss_inquire_cred(3), gss_inquire_context(3), gss_release_cred(3), gss_release_oid_set(3)

STANDARDS

RFC 2743
  Generic Security Service Application Program Interface Version 2, Update 1
RFC 2744
  Generic Security Service API Version 2 : C-bindings

HISTORY

The gss_acquire_cred function first appeared in
.Fx 7.0 .

AUTHORS

John Wray, Iris Associates

COPYRIGHT

Copyright (C) The Internet Society (2000). All Rights Reserved.

This document and translations of it may be copied and furnished to others, and derivative works that comment on or otherwise explain it or assist in its implementation may be prepared, copied, published and distributed, in whole or in part, without restriction of any kind, provided that the above copyright notice and this paragraph are included on all such copies and derivative works. However, this document itself may not be modified in any way, such as by removing the copyright notice or references to the Internet Society or other Internet organizations, except as needed for the purpose of developing Internet standards in which case the procedures for copyrights defined in the Internet Standards process must be followed, or as required to translate it into languages other than English.

The limited permissions granted above are perpetual and will not be revoked by the Internet Society or its successors or assigns.

This document and the information contained herein is provided on an "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

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