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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* lib/krb5/krb/gic_keytab.c
*
* Copyright (C) 2002, 2003, 2008 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. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* 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.
*/
#ifndef LEAN_CLIENT
#include "k5-int.h"
static krb5_error_code
krb5_get_as_key_keytab(
krb5_context context,
krb5_principal client,
krb5_enctype etype,
krb5_prompter_fct prompter,
void *prompter_data,
krb5_data *salt,
krb5_data *params,
krb5_keyblock *as_key,
void *gak_data)
{
krb5_keytab keytab = (krb5_keytab) gak_data;
krb5_error_code ret;
krb5_keytab_entry kt_ent;
krb5_keyblock *kt_key;
/* if there's already a key of the correct etype, we're done.
if the etype is wrong, free the existing key, and make
a new one. */
if (as_key->length) {
if (as_key->enctype == etype)
return(0);
krb5_free_keyblock_contents(context, as_key);
as_key->length = 0;
}
if (!krb5_c_valid_enctype(etype))
return(KRB5_PROG_ETYPE_NOSUPP);
if ((ret = krb5_kt_get_entry(context, keytab, client,
0, /* don't have vno available */
etype, &kt_ent)))
return(ret);
ret = krb5_copy_keyblock(context, &kt_ent.key, &kt_key);
/* again, krb5's memory management is lame... */
*as_key = *kt_key;
free(kt_key);
(void) krb5_kt_free_entry(context, &kt_ent);
return(ret);
}
krb5_error_code KRB5_CALLCONV
krb5_get_init_creds_keytab(krb5_context context,
krb5_creds *creds,
krb5_principal client,
krb5_keytab arg_keytab,
krb5_deltat start_time,
char *in_tkt_service,
krb5_get_init_creds_opt *options)
{
krb5_error_code ret, ret2;
int use_master;
krb5_keytab keytab;
krb5_gic_opt_ext *opte = NULL;
if (arg_keytab == NULL) {
if ((ret = krb5_kt_default(context, &keytab)))
return ret;
} else {
keytab = arg_keytab;
}
ret = krb5int_gic_opt_to_opte(context, options, &opte, 1,
"krb5_get_init_creds_keytab");
if (ret)
return ret;
use_master = 0;
/* first try: get the requested tkt from any kdc */
ret = krb5_get_init_creds(context, creds, client, NULL, NULL,
start_time, in_tkt_service, opte,
krb5_get_as_key_keytab, (void *) keytab,
&use_master,NULL);
/* check for success */
if (ret == 0)
goto cleanup;
/* If all the kdc's are unavailable fail */
if ((ret == KRB5_KDC_UNREACH) || (ret == KRB5_REALM_CANT_RESOLVE))
goto cleanup;
/* if the reply did not come from the master kdc, try again with
the master kdc */
if (!use_master) {
use_master = 1;
ret2 = krb5_get_init_creds(context, creds, client, NULL, NULL,
start_time, in_tkt_service, opte,
krb5_get_as_key_keytab, (void *) keytab,
&use_master, NULL);
if (ret2 == 0) {
ret = 0;
goto cleanup;
}
/* if the master is unreachable, return the error from the
slave we were able to contact */
if ((ret2 == KRB5_KDC_UNREACH) ||
(ret2 == KRB5_REALM_CANT_RESOLVE) ||
(ret2 == KRB5_REALM_UNKNOWN))
goto cleanup;
ret = ret2;
}
/* at this point, we have a response from the master. Since we don't
do any prompting or changing for keytabs, that's it. */
cleanup:
if (opte && krb5_gic_opt_is_shadowed(opte))
krb5_get_init_creds_opt_free(context, (krb5_get_init_creds_opt *)opte);
if (arg_keytab == NULL)
krb5_kt_close(context, keytab);
return(ret);
}
krb5_error_code KRB5_CALLCONV
krb5_get_in_tkt_with_keytab(krb5_context context, krb5_flags options,
krb5_address *const *addrs, krb5_enctype *ktypes,
krb5_preauthtype *pre_auth_types,
krb5_keytab arg_keytab, krb5_ccache ccache,
krb5_creds *creds, krb5_kdc_rep **ret_as_reply)
{
krb5_error_code retval;
krb5_gic_opt_ext *opte;
char * server = NULL;
krb5_keytab keytab;
krb5_principal client_princ, server_princ;
int use_master = 0;
retval = krb5int_populate_gic_opt(context, &opte,
options, addrs, ktypes,
pre_auth_types, creds);
if (retval)
return retval;
if (arg_keytab == NULL) {
retval = krb5_kt_default(context, &keytab);
if (retval)
return retval;
}
else keytab = arg_keytab;
retval = krb5_unparse_name( context, creds->server, &server);
if (retval)
goto cleanup;
server_princ = creds->server;
client_princ = creds->client;
retval = krb5_get_init_creds (context,
creds, creds->client,
krb5_prompter_posix, NULL,
0, server, opte,
krb5_get_as_key_keytab, (void *)keytab,
&use_master, ret_as_reply);
krb5_free_unparsed_name( context, server);
krb5_get_init_creds_opt_free(context, (krb5_get_init_creds_opt *)opte);
if (retval) {
goto cleanup;
}
krb5_free_principal(context, creds->server);
krb5_free_principal(context, creds->client);
creds->client = client_princ;
creds->server = server_princ;
/* store it in the ccache! */
if (ccache)
if ((retval = krb5_cc_store_cred(context, ccache, creds)))
goto cleanup;
cleanup: if (arg_keytab == NULL)
krb5_kt_close(context, keytab);
return retval;
}
#endif /* LEAN_CLIENT */
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