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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* lib/crypto/crypto_tests/t_short.c */
/*
* Copyright (C) 2009 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.
*/
/*
* Tests the outcome of decrypting overly short tokens. This program can be
* run under a tool like valgrind to detect bad memory accesses; when run
* normally by the test suite, it verifies that each operation returns
* KRB5_BAD_MSIZE.
*/
#include "k5-int.h"
krb5_enctype interesting_enctypes[] = {
ENCTYPE_DES_CBC_CRC,
ENCTYPE_DES_CBC_MD4,
ENCTYPE_DES_CBC_MD5,
ENCTYPE_DES3_CBC_SHA1,
ENCTYPE_ARCFOUR_HMAC,
ENCTYPE_ARCFOUR_HMAC_EXP,
ENCTYPE_AES256_CTS_HMAC_SHA1_96,
ENCTYPE_AES128_CTS_HMAC_SHA1_96,
ENCTYPE_CAMELLIA128_CTS_CMAC,
ENCTYPE_CAMELLIA256_CTS_CMAC,
0
};
/* Abort if an operation unexpectedly fails. */
static void
x(krb5_error_code code)
{
if (code != 0)
abort();
}
/* Abort if a decrypt operation doesn't have the expected result. */
static void
check_decrypt_result(krb5_error_code code, size_t len, size_t min_len)
{
if (len < min_len) {
/* Undersized tokens should always result in BAD_MSIZE. */
if (code != KRB5_BAD_MSIZE)
abort();
} else {
/* Min-size tokens should succeed or fail the integrity check. */
if (code != 0 && code != KRB5KRB_AP_ERR_BAD_INTEGRITY)
abort();
}
}
static void
test_enctype(krb5_enctype enctype)
{
krb5_error_code ret;
krb5_keyblock keyblock;
krb5_enc_data input;
krb5_data output;
krb5_crypto_iov iov[2];
unsigned int dummy;
size_t min_len, len;
printf("Testing enctype %d\n", (int) enctype);
x(krb5_c_encrypt_length(NULL, enctype, 0, &min_len));
x(krb5_c_make_random_key(NULL, enctype, &keyblock));
input.enctype = enctype;
/* Try each length up to the minimum length. */
for (len = 0; len <= min_len; len++) {
input.ciphertext.data = calloc(len, 1);
input.ciphertext.length = len;
output.data = calloc(len, 1);
output.length = len;
/* Attempt a normal decryption. */
ret = krb5_c_decrypt(NULL, &keyblock, 0, NULL, &input, &output);
check_decrypt_result(ret, len, min_len);
if (krb5_c_crypto_length(NULL, enctype, KRB5_CRYPTO_TYPE_HEADER,
&dummy) == 0) {
/* Attempt an IOV stream decryption. */
iov[0].flags = KRB5_CRYPTO_TYPE_STREAM;
iov[0].data = input.ciphertext;
iov[1].flags = KRB5_CRYPTO_TYPE_DATA;
iov[1].data.data = NULL;
iov[1].data.length = 0;
ret = krb5_c_decrypt_iov(NULL, &keyblock, 0, NULL, iov, 2);
check_decrypt_result(ret, len, min_len);
}
free(input.ciphertext.data);
free(output.data);
}
krb5int_c_free_keyblock_contents (NULL, &keyblock);
}
int
main(int argc, char **argv)
{
int i;
krb5_data notrandom;
notrandom.data = "notrandom";
notrandom.length = 9;
krb5_c_random_seed(NULL, ¬random);
for (i = 0; interesting_enctypes[i]; i++)
test_enctype(interesting_enctypes[i]);
return 0;
}
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