krb5/krb/copy_creds.c

/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
 * lib/krb5/krb/copy_creds.c
 *
 * Copyright 1990,1991 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_copy_cred()
 */

#include "k5-int.h"

/*
 * Copy credentials, allocating fresh storage where needed.
 */

krb5_error_code KRB5_CALLCONV
krb5_copy_creds(krb5_context context, const krb5_creds *incred, krb5_creds **outcred)
{
    krb5_creds *tempcred;
    krb5_error_code retval;

    if (!(tempcred = (krb5_creds *)malloc(sizeof(*tempcred))))
        return ENOMEM;

    retval = krb5int_copy_creds_contents(context, incred, tempcred);
    if (retval)
        free(tempcred);
    else
        *outcred = tempcred;
    return retval;
}

/*
 * Copy contents of input credentials structure to supplied
 * destination, allocating storage for indirect fields as needed.  On
 * success, the output is a deep copy of the input.  On error, the
 * output structure is garbage and its contents should be ignored.
 */
krb5_error_code
krb5int_copy_creds_contents(krb5_context context, const krb5_creds *incred,
                            krb5_creds *tempcred)
{
    krb5_error_code retval;
    krb5_data *scratch;

    *tempcred = *incred;
    retval = krb5_copy_principal(context, incred->client, &tempcred->client);
    if (retval)
        goto cleanlast;
    retval = krb5_copy_principal(context, incred->server, &tempcred->server);
    if (retval)
        goto cleanclient;
    retval = krb5_copy_keyblock_contents(context, &incred->keyblock,
                                         &tempcred->keyblock);
    if (retval)
        goto cleanserver;
    retval = krb5_copy_addresses(context, incred->addresses, &tempcred->addresses);
    if (retval)
        goto cleanblock;
    retval = krb5_copy_data(context, &incred->ticket, &scratch);
    if (retval)
        goto cleanaddrs;
    tempcred->ticket = *scratch;
    free(scratch);
    retval = krb5_copy_data(context, &incred->second_ticket, &scratch);
    if (retval)
        goto clearticket;

    tempcred->second_ticket = *scratch;
    free(scratch);

    retval = krb5_copy_authdata(context, incred->authdata,&tempcred->authdata);
    if (retval)
        goto clearsecondticket;

    return 0;

clearsecondticket:
    memset(tempcred->second_ticket.data,0,tempcred->second_ticket.length);
    free(tempcred->second_ticket.data);
clearticket:
    memset(tempcred->ticket.data,0,tempcred->ticket.length);
    free(tempcred->ticket.data);
cleanaddrs:
    krb5_free_addresses(context, tempcred->addresses);
cleanblock:
    free(tempcred->keyblock.contents);
cleanserver:
    krb5_free_principal(context, tempcred->server);
cleanclient:
    krb5_free_principal(context, tempcred->client);
cleanlast:
    /* Do not free tempcred - we did not allocate it - its contents are
       garbage - but we should not free it */
    return retval;
}