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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* tests/fuzzing/fuzz_util.c */
/*
* Copyright (C) 2024 by Arjun. 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.
*/
/*
* Fuzzing harness implementation for k5_base64_decode, k5_hex_decode
* krb5_parse_name and k5_parse_host_string.
*/
#include "autoconf.h"
#include <k5-int.h>
#include <k5-base64.h>
#include <k5-hex.h>
#include <string.h>
#define kMinInputLength 2
#define kMaxInputLength 256
extern int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
static void
fuzz_base64(const char *data_in, size_t size)
{
size_t len;
free(k5_base64_encode(data_in, size));
free(k5_base64_decode(data_in, &len));
}
static void
fuzz_hex(const char *data_in, size_t size)
{
char *hex;
uint8_t *bytes;
size_t len;
if (k5_hex_encode(data_in, size, 0, &hex) == 0)
free(hex);
if (k5_hex_encode(data_in, size, 1, &hex) == 0)
free(hex);
if (k5_hex_decode(data_in, &bytes, &len) == 0)
free(bytes);
}
static void
fuzz_name(const char *data_in, size_t size)
{
krb5_context context;
krb5_principal fuzzing;
if (krb5_init_context(&context) != 0)
return;
krb5_parse_name(context, data_in, &fuzzing);
krb5_free_principal(context, fuzzing);
krb5_free_context(context);
}
static void
fuzz_parse_host(const char *data_in, size_t size)
{
char *host_out = NULL;
int port_out = -1;
if (k5_parse_host_string(data_in, 1, &host_out, &port_out) == 0)
free(host_out);
}
extern int
LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
{
krb5_error_code ret;
char *data_in;
if (size < kMinInputLength || size > kMaxInputLength)
return 0;
data_in = k5memdup0(data, size, &ret);
if (data_in == NULL)
return 0;
fuzz_base64(data_in, size);
fuzz_hex(data_in, size);
fuzz_name(data_in, size);
fuzz_parse_host(data_in, size);
free(data_in);
return 0;
}
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