1 /* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
2 /* tests/fuzzing/fuzz_pac.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_pac_parse.
34 */
35
36 #include "autoconf.h"
37 #include <k5-int.h>
38
39 #define U(x) (uint8_t *)x
40 #define kMinInputLength 2
41 #define kMaxInputLength 1024
42
43 static const krb5_keyblock kdc_keyblock = {
44 0, ENCTYPE_ARCFOUR_HMAC,
45 16, U("\xB2\x86\x75\x71\x48\xAF\x7F\xD2\x52\xC5\x36\x03\xA1\x50\xB7\xE7")
46 };
47
48 static const krb5_keyblock member_keyblock = {
49 0, ENCTYPE_ARCFOUR_HMAC,
50 16, U("\xD2\x17\xFA\xEA\xE5\xE6\xB5\xF9\x5C\xCC\x94\x07\x7A\xB8\xA5\xFC")
51 };
52
53 static time_t authtime = 1120440609;
54 static const char *user = "w2003final$@WIN2K3.THINKER.LOCAL";
55
56 extern int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
57
58 int
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)59 LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
60 {
61 krb5_error_code ret;
62 krb5_context context = NULL;
63 krb5_pac pac;
64 krb5_principal princ = NULL;
65
66 if (size < kMinInputLength || size > kMaxInputLength)
67 return 0;
68
69 ret = krb5_init_context(&context);
70 if (ret)
71 return 0;
72
73 ret = krb5_parse_name(context, user, &princ);
74 if (ret)
75 goto cleanup;
76
77 ret = krb5_pac_parse(context, data, size, &pac);
78 if (ret)
79 goto cleanup;
80
81 krb5_pac_verify(context, pac, authtime, princ, NULL, NULL);
82 krb5_pac_verify_ext(context, pac, authtime, princ, NULL, NULL, TRUE);
83 krb5_pac_verify(context, pac, authtime, princ, &member_keyblock,
84 &kdc_keyblock);
85
86 krb5_pac_free(context, pac);
87
88 cleanup:
89 krb5_free_principal(context, princ);
90 krb5_free_context(context);
91
92 return 0;
93 }
94