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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* kdc/authind.c - Functions for manipulating authentication indicator lists */
/*
* Copyright (C) 2015 by the Massachusetts Institute of Technology.
* 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.
*
* 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 HOLDER 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 "kdc_util.h"
/* Return true if ind matches an entry in indicators. */
krb5_boolean
authind_contains(krb5_data *const *indicators, const char *ind)
{
for (; indicators != NULL && *indicators != NULL; indicators++) {
if (data_eq_string(**indicators, ind))
return TRUE;
}
return FALSE;
}
/* Add ind to *indicators, reallocating as necessary. */
krb5_error_code
authind_add(krb5_context context, const char *ind, krb5_data ***indicators)
{
size_t count;
krb5_data **list = *indicators, *dptr, d;
/* Count the number of existing indicators and check for duplicates. */
for (count = 0; list != NULL && list[count] != NULL; count++) {
if (data_eq_string(*list[count], ind))
return 0;
}
/* Allocate space for a new entry. */
list = realloc(list, (count + 2) * sizeof(*list));
if (list == NULL)
return ENOMEM;
*indicators = list;
/* Add a copy of ind (as a krb5_data object) to the list. */
d = string2data((char *)ind);
if (krb5_copy_data(context, &d, &dptr) != 0)
return ENOMEM;
list[count++] = dptr;
list[count] = NULL;
return 0;
}
/* Add all auth indicators from authdata to *indicators, reallocating as
* necessary. (Currently does not compress duplicates.) */
krb5_error_code
authind_extract(krb5_context context, krb5_authdata **authdata,
krb5_data ***indicators)
{
krb5_error_code ret;
size_t count, scount;
krb5_authdata **ind_authdata = NULL, **adp;
krb5_data der_indicators, **strings = NULL, **list = *indicators;
for (count = 0; list != NULL && list[count] != NULL; count++);
ret = krb5_find_authdata(context, authdata, NULL,
KRB5_AUTHDATA_AUTH_INDICATOR, &ind_authdata);
if (ret)
goto cleanup;
for (adp = ind_authdata; adp != NULL && *adp != NULL; adp++) {
/* Decode this authdata element into an auth indicator list. */
der_indicators = make_data((*adp)->contents, (*adp)->length);
ret = decode_utf8_strings(&der_indicators, &strings);
if (ret == ENOMEM)
goto cleanup;
if (ret)
continue;
/* Count the entries in strings and allocate space in list. */
for (scount = 0; strings != NULL && strings[scount] != NULL; scount++);
list = realloc(list, (count + scount + 1) * sizeof(*list));
if (list == NULL) {
ret = ENOMEM;
goto cleanup;
}
*indicators = list;
/* Steal the krb5_data pointers from strings and free the array. */
memcpy(list + count, strings, scount * sizeof(*strings));
count += scount;
list[count] = NULL;
free(strings);
strings = NULL;
}
cleanup:
krb5_free_authdata(context, ind_authdata);
k5_free_data_ptr_list(strings);
return ret;
}
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