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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* lib/krb5/krb/decode_kdc.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. 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.
*/
#include "k5-int.h"
#include "int-proto.h"
#include "fast.h"
/*
Takes a KDC_REP message and decrypts encrypted part using etype and
*key, putting result in *rep.
dec_rep->client,ticket,session,last_req,server,caddrs
are all set to allocated storage which should be freed by the caller
when finished with the response.
If the response isn't a KDC_REP (tgs or as), it returns an error from
the decoding routines.
returns errors from encryption routines, system errors
*/
krb5_error_code
krb5int_decode_tgs_rep(krb5_context context,
struct krb5int_fast_request_state *fast_state,
krb5_data *enc_rep, const krb5_keyblock *key,
krb5_keyusage usage, krb5_kdc_rep **dec_rep_out)
{
krb5_error_code retval;
krb5_kdc_rep *dec_rep = NULL;
krb5_keyblock *strengthen_key = NULL, tgs_key;
tgs_key.contents = NULL;
if (krb5_is_as_rep(enc_rep))
retval = decode_krb5_as_rep(enc_rep, &dec_rep);
else if (krb5_is_tgs_rep(enc_rep))
retval = decode_krb5_tgs_rep(enc_rep, &dec_rep);
else
retval = KRB5KRB_AP_ERR_MSG_TYPE;
if (retval)
goto cleanup;
retval = krb5int_fast_process_response(context, fast_state, dec_rep,
&strengthen_key);
if (retval == KRB5_ERR_FAST_REQUIRED)
retval = 0;
else if (retval)
goto cleanup;
retval = krb5int_fast_reply_key(context, strengthen_key, key, &tgs_key);
if (retval)
goto cleanup;
retval = krb5_kdc_rep_decrypt_proc(context, &tgs_key, &usage, dec_rep);
if (retval)
goto cleanup;
*dec_rep_out = dec_rep;
dec_rep = NULL;
cleanup:
krb5_free_kdc_rep(context, dec_rep);
krb5_free_keyblock(context, strengthen_key);
krb5_free_keyblock_contents(context, &tgs_key);
return retval;
}
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