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/*
* ac_cred.c --- gss_acquire_cred
*
* $Source$
* $Author$
* $Header$
*
* Copyright 1991 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* For copying and distribution information, please see the file
* <krb5/copyright.h>.
*
*/
/*
* Note: There are really two kinds of credentials in Kerberos V5...
* the first kind is for users, and we use a krb5_ccache to get at
* that. The second kind is for servers, and we use a krb5_keytab to
* point at that.
*
* It is possible to convert from one to another, but we don't address
* that right now.
*
* XXX We need to do something with time_rec.
*/
#include <gssapi.h>
char *gss_krb5_fetchfrom = NULL;
OM_uint32 gss_acquire_cred(minor_status, desired_name, time_req,
desired_mechs, cred_usage, output_cred_handle,
actual_mechs, time_rec)
OM_uint32 *minor_status;
gss_name_t desired_name;
OM_uint32 time_req;
gss_OID_set desired_mechs;
int cred_usage;
gss_cred_id_t *output_cred_handle;
gss_OID_set *actual_mechs;
OM_uint32 *time_rec;
{
krb5_keytab_entry entry;
krb5_keytab keytabid;
int do_kerberos = 0;
int i;
krb5_error_code retval;
*minor_status = 0;
/*
* Figure out which mechanism we should be using.
*/
if (desired_mechs == GSS_C_NULL_OID_SET)
do_kerberos++;
else {
for (i = 0; i <= desired_mechs->count; i++) {
if (gss_compare_OID(&desired_mechs->elements[i],
&gss_OID_krb5))
do_kerberos++;
}
}
/*
* Should we return failure here?
*/
if (!do_kerberos)
return(gss_make_re(GSS_RE_FAILURE));
output_cred_handle->cred_flags = 0;
/*
* This is Kerberos V5 specific stuff starting here.
* First, let's try to search the keytab file.
* Applications that know what they are doing can mess with
* the variable gss_krb_fetchfrom. Otherwise, we use the
* system default keytab file.
*/
if (*minor_status = krb5_copy_principal(desired_name,
&output_cred_handle->principal)) {
return(gss_make_re(GSS_RE_FAILURE));
}
if (gss_krb5_fetchfrom) {
/* use the named keytab */
retval = krb5_kt_resolve(gss_krb5_fetchfrom, &keytabid);
} else {
/* use default keytab */
retval = krb5_kt_default(&keytabid);
}
if (!retval) {
retval = krb5_kt_get_entry(keytabid, desired_name, 0,
&entry);
(void) krb5_kt_close(keytabid);
if (!retval) {
output_cred_handle->cred_flags |= GSS_KRB_HAS_SRVTAB;
output_cred_handle->kvno = entry.vno;
output_cred_handle->srvtab = entry.key;
krb5_free_principal(entry.principal);
}
}
/*
* Now let's try opening the default credentials file and see
* if it contains the desired name. We could try searching
* some directory (like /tmp) if we really cared, but not for
* now.
*
* We're not even looking in the default credentials file
* right now. XXX
*/
/*
* We're done, clean up and get out.
*/
if (actual_mechs) {
gss_OID_set set;
if (!(set = (gss_OID_set)
malloc (sizeof(struct gss_OID_set_desc)))) {
*minor_status = ENOMEM;
return(gss_make_re(GSS_RE_FAILURE));
}
set->count = 1;
set->elements = &gss_OID_krb5;
*actual_mechs = set;
}
return(GSS_S_COMPLETE);
}
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