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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* lib/krb5/krb/authdata_dec.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.
*/
/*
* Copyright (c) 2006-2008, Novell, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * The copyright holder's name is not used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "k5-int.h"
#include "int-proto.h"
krb5_error_code KRB5_CALLCONV
krb5_decode_authdata_container(krb5_context context,
krb5_authdatatype type,
const krb5_authdata *container,
krb5_authdata ***authdata)
{
krb5_error_code code;
krb5_data data;
*authdata = NULL;
if ((container->ad_type & AD_TYPE_FIELD_TYPE_MASK) != type)
return EINVAL;
data.length = container->length;
data.data = (char *)container->contents;
code = decode_krb5_authdata(&data, authdata);
if (code)
return code;
return 0;
}
struct find_authdata_context {
krb5_authdata **out;
size_t space;
size_t length;
};
static krb5_error_code
grow_find_authdata(krb5_context context, struct find_authdata_context *fctx,
krb5_authdata *elem)
{
krb5_error_code retval = 0;
if (fctx->length == fctx->space) {
krb5_authdata **new;
if (fctx->space >= 256) {
krb5_set_error_message(context, ERANGE,
"More than 256 authdata matched a query");
return ERANGE;
}
new = realloc(fctx->out,
sizeof (krb5_authdata *)*(2*fctx->space+1));
if (new == NULL)
return ENOMEM;
fctx->out = new;
fctx->space *=2;
}
fctx->out[fctx->length+1] = NULL;
retval = krb5int_copy_authdatum(context, elem,
&fctx->out[fctx->length]);
if (retval == 0)
fctx->length++;
return retval;
}
static krb5_error_code
find_authdata_1(krb5_context context, krb5_authdata *const *in_authdat,
krb5_authdatatype ad_type, struct find_authdata_context *fctx,
int from_ap_req)
{
int i = 0;
krb5_error_code retval = 0;
for (i = 0; in_authdat[i] && retval == 0; i++) {
krb5_authdata *ad = in_authdat[i];
krb5_authdata **decoded_container;
switch (ad->ad_type) {
case KRB5_AUTHDATA_IF_RELEVANT:
if (retval == 0)
retval = krb5_decode_authdata_container(context,
ad->ad_type,
ad,
&decoded_container);
if (retval == 0) {
retval = find_authdata_1(context,
decoded_container,
ad_type,
fctx,
from_ap_req);
krb5_free_authdata(context, decoded_container);
}
break;
case KRB5_AUTHDATA_SIGNTICKET:
case KRB5_AUTHDATA_KDC_ISSUED:
case KRB5_AUTHDATA_WIN2K_PAC:
if (from_ap_req)
continue;
default:
if (ad->ad_type == ad_type && retval == 0)
retval = grow_find_authdata(context, fctx, ad);
break;
}
}
return retval;
}
krb5_error_code KRB5_CALLCONV
krb5_find_authdata(krb5_context context,
krb5_authdata *const *ticket_authdata,
krb5_authdata *const *ap_req_authdata,
krb5_authdatatype ad_type, krb5_authdata ***results)
{
krb5_error_code retval = 0;
struct find_authdata_context fctx;
fctx.length = 0;
fctx.space = 2;
fctx.out = calloc(fctx.space+1, sizeof (krb5_authdata *));
*results = NULL;
if (fctx.out == NULL)
return ENOMEM;
if (ticket_authdata)
retval = find_authdata_1( context, ticket_authdata, ad_type, &fctx, 0);
if ((retval==0) && ap_req_authdata)
retval = find_authdata_1( context, ap_req_authdata, ad_type, &fctx, 1);
if ((retval== 0) && fctx.length)
*results = fctx.out;
else krb5_free_authdata(context, fctx.out);
return retval;
}
krb5_error_code KRB5_CALLCONV
krb5_verify_authdata_kdc_issued(krb5_context context,
const krb5_keyblock *key,
const krb5_authdata *ad_kdcissued,
krb5_principal *issuer,
krb5_authdata ***authdata)
{
krb5_error_code code;
krb5_ad_kdcissued *ad_kdci;
krb5_data data, *data2;
krb5_boolean valid = FALSE;
if ((ad_kdcissued->ad_type & AD_TYPE_FIELD_TYPE_MASK) !=
KRB5_AUTHDATA_KDC_ISSUED)
return EINVAL;
if (issuer != NULL)
*issuer = NULL;
if (authdata != NULL)
*authdata = NULL;
data.length = ad_kdcissued->length;
data.data = (char *)ad_kdcissued->contents;
code = decode_krb5_ad_kdcissued(&data, &ad_kdci);
if (code != 0)
return code;
if (!krb5_c_is_keyed_cksum(ad_kdci->ad_checksum.checksum_type)) {
krb5_free_ad_kdcissued(context, ad_kdci);
return KRB5KRB_AP_ERR_INAPP_CKSUM;
}
code = encode_krb5_authdata(ad_kdci->elements, &data2);
if (code != 0) {
krb5_free_ad_kdcissued(context, ad_kdci);
return code;
}
code = krb5_c_verify_checksum(context, key,
KRB5_KEYUSAGE_AD_KDCISSUED_CKSUM,
data2, &ad_kdci->ad_checksum, &valid);
if (code != 0) {
krb5_free_ad_kdcissued(context, ad_kdci);
krb5_free_data(context, data2);
return code;
}
krb5_free_data(context, data2);
if (valid == FALSE) {
krb5_free_ad_kdcissued(context, ad_kdci);
return KRB5KRB_AP_ERR_BAD_INTEGRITY;
}
if (issuer != NULL) {
*issuer = ad_kdci->i_principal;
ad_kdci->i_principal = NULL;
}
if (authdata != NULL) {
*authdata = ad_kdci->elements;
ad_kdci->elements = NULL;
}
krb5_free_ad_kdcissued(context, ad_kdci);
return 0;
}
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