1 /*
2 * Copyright 2016-2025 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 * https://www.openssl.org/source/license.html
8 * or in the file LICENSE in the source distribution.
9 */
10
11 #include <openssl/x509.h>
12 #include <openssl/ocsp.h>
13 #include <openssl/bio.h>
14 #include <openssl/err.h>
15 #include <openssl/rand.h>
16 #include "fuzzer.h"
17
FuzzerInitialize(int * argc,char *** argv)18 int FuzzerInitialize(int *argc, char ***argv)
19 {
20 FuzzerSetRand();
21 OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CRYPTO_STRINGS
22 | OPENSSL_INIT_ADD_ALL_CIPHERS | OPENSSL_INIT_ADD_ALL_DIGESTS, NULL);
23 ERR_clear_error();
24 CRYPTO_free_ex_index(0, -1);
25 return 1;
26 }
27
cb(int ok,X509_STORE_CTX * ctx)28 static int cb(int ok, X509_STORE_CTX *ctx)
29 {
30 return 1;
31 }
32
FuzzerTestOneInput(const uint8_t * buf,size_t len)33 int FuzzerTestOneInput(const uint8_t *buf, size_t len)
34 {
35 const unsigned char *p = buf;
36 size_t orig_len = len;
37 unsigned char *der = NULL;
38 BIO *bio = NULL;
39 X509 *x509_1 = NULL, *x509_2 = NULL;
40 X509_STORE *store = NULL;
41 X509_VERIFY_PARAM *param = NULL;
42 X509_STORE_CTX *ctx = NULL;
43 X509_CRL *crl = NULL;
44 STACK_OF(X509_CRL) *crls = NULL;
45 STACK_OF(X509) *certs = NULL;
46 OCSP_RESPONSE *resp = NULL;
47 OCSP_BASICRESP *bs = NULL;
48 OCSP_CERTID *id = NULL;
49
50 x509_1 = d2i_X509(NULL, &p, len);
51 if (x509_1 == NULL)
52 goto err;
53
54 bio = BIO_new(BIO_s_null());
55 if (bio == NULL)
56 goto err;
57
58 /* This will load and print the public key as well as extensions */
59 X509_print(bio, x509_1);
60 BIO_free(bio);
61
62 X509_issuer_and_serial_hash(x509_1);
63
64 i2d_X509(x509_1, &der);
65 OPENSSL_free(der);
66
67 len = orig_len - (p - buf);
68 x509_2 = d2i_X509(NULL, &p, len);
69 if (x509_2 == NULL)
70 goto err;
71
72 len = orig_len - (p - buf);
73 crl = d2i_X509_CRL(NULL, &p, len);
74 if (crl == NULL)
75 goto err;
76
77 len = orig_len - (p - buf);
78 resp = d2i_OCSP_RESPONSE(NULL, &p, len);
79
80 store = X509_STORE_new();
81 if (store == NULL)
82 goto err;
83 X509_STORE_add_cert(store, x509_2);
84
85 param = X509_VERIFY_PARAM_new();
86 if (param == NULL)
87 goto err;
88 X509_VERIFY_PARAM_set_flags(param, X509_V_FLAG_NO_CHECK_TIME);
89 X509_VERIFY_PARAM_set_flags(param, X509_V_FLAG_X509_STRICT);
90 X509_VERIFY_PARAM_set_flags(param, X509_V_FLAG_PARTIAL_CHAIN);
91 X509_VERIFY_PARAM_set_flags(param, X509_V_FLAG_CRL_CHECK);
92
93 X509_STORE_set1_param(store, param);
94
95 X509_STORE_set_verify_cb(store, cb);
96
97 ctx = X509_STORE_CTX_new();
98 if (ctx == NULL)
99 goto err;
100
101 X509_STORE_CTX_init(ctx, store, x509_1, NULL);
102
103 if (crl != NULL) {
104 crls = sk_X509_CRL_new_null();
105 if (crls == NULL
106 || !sk_X509_CRL_push(crls, crl))
107 goto err;
108
109 X509_STORE_CTX_set0_crls(ctx, crls);
110 }
111
112 X509_verify_cert(ctx);
113
114 if (resp != NULL)
115 bs = OCSP_response_get1_basic(resp);
116
117 if (bs != NULL) {
118 int status, reason;
119 ASN1_GENERALIZEDTIME *revtime, *thisupd, *nextupd;
120
121 certs = sk_X509_new_null();
122 if (certs == NULL
123 || !sk_X509_push(certs, x509_1)
124 || !sk_X509_push(certs, x509_2))
125 goto err;
126
127 OCSP_basic_verify(bs, certs, store, OCSP_PARTIAL_CHAIN);
128
129 id = OCSP_cert_to_id(NULL, x509_1, x509_2);
130 if (id == NULL)
131 goto err;
132 OCSP_resp_find_status(bs, id, &status, &reason, &revtime, &thisupd,
133 &nextupd);
134 }
135
136 err:
137 X509_STORE_CTX_free(ctx);
138 X509_VERIFY_PARAM_free(param);
139 X509_STORE_free(store);
140 X509_free(x509_1);
141 X509_free(x509_2);
142 X509_CRL_free(crl);
143 OCSP_CERTID_free(id);
144 OCSP_BASICRESP_free(bs);
145 OCSP_RESPONSE_free(resp);
146 sk_X509_CRL_free(crls);
147 sk_X509_free(certs);
148
149 ERR_clear_error();
150 return 0;
151 }
152
FuzzerCleanup(void)153 void FuzzerCleanup(void)
154 {
155 FuzzerClearRand();
156 }
157