1 /* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
2 /* tests/fuzzing/fuzz_krb5_ticket.c */
3 /*
4 * Copyright (C) 2024 by Arjun. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * * Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * * Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
21 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
22 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
23 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
25 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
27 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
29 * OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 /*
33 * Fuzzing harness implementation for krb5_decode_ticket.
34 */
35
36 #include "autoconf.h"
37 #include <k5-int.h>
38 #include <krb5.h>
39 #include <string.h>
40
41 #define kMinInputLength 2
42 #define kMaxInputLength 2048
43
44 extern int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
45
46 int
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)47 LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
48 {
49 krb5_error_code ret;
50 krb5_context context = NULL;
51 krb5_keytab defkt = NULL;
52 krb5_data data_in, *data_out;
53 krb5_ticket *ticket = NULL;
54
55 if (size < kMinInputLength || size > kMaxInputLength)
56 return 0;
57
58 data_in = make_data((void *)data, size);
59
60 ret = krb5_init_context(&context);
61 if (ret)
62 return 0;
63
64 ret = krb5_kt_default(context, &defkt);
65 if (ret)
66 goto cleanup;
67
68 ret = krb5_decode_ticket(&data_in, &ticket);
69 if (ret)
70 goto cleanup;
71
72 ret = encode_krb5_ticket(ticket, &data_out);
73 if (!ret)
74 krb5_free_data(context, data_out);
75
76 krb5_server_decrypt_ticket_keytab(context, defkt, ticket);
77
78 cleanup:
79 krb5_free_ticket(context, ticket);
80 if (defkt != NULL)
81 krb5_kt_close(context, defkt);
82 krb5_free_context(context);
83
84 return 0;
85 }
86