fuzz_marshal_princ.c

/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* tests/fuzzing/fuzz_marshal_princ.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
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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
 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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/*
 * Fuzzing harness implementation for k5_unmarshal_princ.
 */

#include "autoconf.h"
#include <cc-int.h>

#define FIRST_VERSION 1

#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_principal princ;
    int version;
    struct k5buf buf;

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

    for (version = FIRST_VERSION; version <= 4; version++) {
        ret = k5_unmarshal_princ(data, size, version, &princ);
        if (!ret) {
            k5_buf_init_dynamic(&buf);
            k5_marshal_princ(&buf, version, princ);
            k5_buf_free(&buf);
        }

        krb5_free_principal(NULL, princ);
    }

    return 0;
}