1*f1c4c3daSCy Schubert /* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
2*f1c4c3daSCy Schubert /* tests/fuzzing/fuzz_json.c */
3*f1c4c3daSCy Schubert /*
4*f1c4c3daSCy Schubert * Copyright (C) 2024 by Arjun. All rights reserved.
5*f1c4c3daSCy Schubert *
6*f1c4c3daSCy Schubert * Redistribution and use in source and binary forms, with or without
7*f1c4c3daSCy Schubert * modification, are permitted provided that the following conditions
8*f1c4c3daSCy Schubert * are met:
9*f1c4c3daSCy Schubert *
10*f1c4c3daSCy Schubert * * Redistributions of source code must retain the above copyright
11*f1c4c3daSCy Schubert * notice, this list of conditions and the following disclaimer.
12*f1c4c3daSCy Schubert *
13*f1c4c3daSCy Schubert * * Redistributions in binary form must reproduce the above copyright
14*f1c4c3daSCy Schubert * notice, this list of conditions and the following disclaimer in
15*f1c4c3daSCy Schubert * the documentation and/or other materials provided with the
16*f1c4c3daSCy Schubert * distribution.
17*f1c4c3daSCy Schubert *
18*f1c4c3daSCy Schubert * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19*f1c4c3daSCy Schubert * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20*f1c4c3daSCy Schubert * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
21*f1c4c3daSCy Schubert * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
22*f1c4c3daSCy Schubert * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
23*f1c4c3daSCy Schubert * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
24*f1c4c3daSCy Schubert * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
25*f1c4c3daSCy Schubert * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26*f1c4c3daSCy Schubert * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
27*f1c4c3daSCy Schubert * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28*f1c4c3daSCy Schubert * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
29*f1c4c3daSCy Schubert * OF THE POSSIBILITY OF SUCH DAMAGE.
30*f1c4c3daSCy Schubert */
31*f1c4c3daSCy Schubert
32*f1c4c3daSCy Schubert /*
33*f1c4c3daSCy Schubert * Fuzzing harness implementation for k5_json_decode.
34*f1c4c3daSCy Schubert */
35*f1c4c3daSCy Schubert
36*f1c4c3daSCy Schubert #include "autoconf.h"
37*f1c4c3daSCy Schubert #include <k5-int.h>
38*f1c4c3daSCy Schubert #include <krb5.h>
39*f1c4c3daSCy Schubert #include <k5-json.h>
40*f1c4c3daSCy Schubert #include <string.h>
41*f1c4c3daSCy Schubert
42*f1c4c3daSCy Schubert #define kMinInputLength 2
43*f1c4c3daSCy Schubert #define kMaxInputLength 1024
44*f1c4c3daSCy Schubert
45*f1c4c3daSCy Schubert extern int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
46*f1c4c3daSCy Schubert
47*f1c4c3daSCy Schubert int
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)48*f1c4c3daSCy Schubert LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
49*f1c4c3daSCy Schubert {
50*f1c4c3daSCy Schubert krb5_error_code ret;
51*f1c4c3daSCy Schubert k5_json_value decoded = NULL;
52*f1c4c3daSCy Schubert char *data_in = NULL, *data_out;
53*f1c4c3daSCy Schubert
54*f1c4c3daSCy Schubert if (size < kMinInputLength || size > kMaxInputLength)
55*f1c4c3daSCy Schubert return 0;
56*f1c4c3daSCy Schubert
57*f1c4c3daSCy Schubert data_in = k5memdup0(data, size, &ret);
58*f1c4c3daSCy Schubert if (data_in == NULL)
59*f1c4c3daSCy Schubert return 0;
60*f1c4c3daSCy Schubert
61*f1c4c3daSCy Schubert ret = k5_json_decode(data_in, &decoded);
62*f1c4c3daSCy Schubert if (ret)
63*f1c4c3daSCy Schubert goto cleanup;
64*f1c4c3daSCy Schubert
65*f1c4c3daSCy Schubert ret = k5_json_encode(decoded, &data_out);
66*f1c4c3daSCy Schubert if (!ret)
67*f1c4c3daSCy Schubert free(data_out);
68*f1c4c3daSCy Schubert
69*f1c4c3daSCy Schubert cleanup:
70*f1c4c3daSCy Schubert free(data_in);
71*f1c4c3daSCy Schubert k5_json_release(decoded);
72*f1c4c3daSCy Schubert
73*f1c4c3daSCy Schubert return 0;
74*f1c4c3daSCy Schubert }
75