xref: /illumos-gate/usr/src/lib/gss_mechs/mech_krb5/krb5/krb/kdc_rep_dc.c (revision 7c478bd95313f5f23a4c958a745db2134aa03244)

/*
 * Copyright 2002 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

/*
 * lib/krb5/krb/kdc_rep_dc.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.
 *
 *
 * krb5_kdc_rep_decrypt_proc()
 */

#include <k5-int.h>

/*
 * Decrypt the encrypted portion of the KDC_REP message, using the key
 * passed.
 *
 */

/*ARGSUSED*/
krb5_error_code
krb5_kdc_rep_decrypt_proc(context, key, decryptarg, dec_rep)
    krb5_context context;
    const krb5_keyblock * key;
    krb5_const_pointer decryptarg;
    krb5_kdc_rep * dec_rep;
{
    krb5_error_code retval;
    krb5_data scratch;
    krb5_enc_kdc_rep_part *local_encpart;
    krb5_keyusage usage;

    if (decryptarg) {
	usage = *(const krb5_keyusage *) decryptarg;
    } else {
	usage = KRB5_KEYUSAGE_AS_REP_ENCPART;
    }

    /* set up scratch decrypt/decode area */

    scratch.length = dec_rep->enc_part.ciphertext.length;
    if (!(scratch.data = malloc(dec_rep->enc_part.ciphertext.length))) {
	return(ENOMEM);
    }

    (void) (dec_rep->enc_part.enctype);

    retval = krb5_c_decrypt(context, key, usage, 0, &dec_rep->enc_part,
				 &scratch);
    if (retval) {
	free(scratch.data);
	return(retval);
    }

#define clean_scratch() {memset(scratch.data, 0, scratch.length); \
free(scratch.data);}

    /* and do the decode */
    retval = decode_krb5_enc_kdc_rep_part(&scratch, &local_encpart);
    clean_scratch();
    if (retval)
	return retval;

    dec_rep->enc_part2 = local_encpart;

    return 0;
}