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/*
* lib/krb5/keytab/read_servi.c
*
* Copyright 1990 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
*
* This routine is designed to be passed to krb5_rd_req.
* It is a convenience function that reads a key out of a keytab.
* It handles all of the opening and closing of the keytab
* internally.
*/
#include "k5-int.h"
#define KSUCCESS 0
/*
* effects: If keyprocarg is not NULL, it is taken to be the name of a
* keytab. Otherwise, the default keytab will be used. This
* routine opens the keytab and finds the principal associated with
* principal, vno, and enctype and returns the resulting key in *key
* or returning an error code if it is not found.
* returns: Either KSUCCESS or error code.
* errors: error code if not found or keyprocarg is invalid.
*/
krb5_error_code
krb5_kt_read_service_key(context, keyprocarg, principal, vno, enctype, key)
krb5_context context;
krb5_pointer keyprocarg;
krb5_principal principal;
krb5_kvno vno;
krb5_enctype enctype;
krb5_keyblock ** key;
{
krb5_error_code kerror = KSUCCESS;
char keytabname[MAX_KEYTAB_NAME_LEN + 1]; /* + 1 for NULL termination */
krb5_keytab id;
krb5_keytab_entry entry;
/*
* Get the name of the file that we should use.
*/
if (!keyprocarg) {
if ((kerror = krb5_kt_default_name(context, (char *)keytabname,
sizeof(keytabname) - 1))!= KSUCCESS)
return (kerror);
} else {
memset(keytabname, 0, sizeof(keytabname));
(void) strncpy(keytabname, (char *)keyprocarg,
sizeof(keytabname) - 1);
}
if ((kerror = krb5_kt_resolve(context, (char *)keytabname, &id)))
return (kerror);
kerror = krb5_kt_get_entry(context, id, principal, vno, enctype, &entry);
krb5_kt_close(context, id);
if (kerror)
return(kerror);
krb5_copy_keyblock(context, &entry.key, key);
krb5_kt_free_entry(context, &entry);
return (KSUCCESS);
}
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