fuzz_attrset.c

/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* tests/fuzzing/fuzz_attrset.c - fuzzing harness for kr_attrset functions */
/*
 * 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
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 * * 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
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 *
 * 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
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#include "autoconf.h"
#include <k5-int.h>
#include <internal.h>

#define kMinInputLength 2
#define kMaxInputLength 1024

extern int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);

int
LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
{
    krb5_error_code ret;
    krb5_context context;
    krad_attrset *set;
    krb5_data data_in;
    uint8_t buffer[KRAD_PACKET_SIZE_MAX], auth[MD5_DIGEST_SIZE] = { 0 };
    size_t encode_len;

    if (size < kMinInputLength || size > kMaxInputLength)
        return 0;

    data_in = make_data((void *)data, size);

    ret = krb5_init_context(&context);
    if (ret)
        return 0;

    ret = kr_attrset_decode(context, &data_in, "f", auth, &set);
    if (!ret)
        kr_attrset_encode(set, "f", auth, FALSE, buffer, &encode_len);

    krad_attrset_free(set);
    krb5_free_context(context);

    return 0;
}