1 /*
2 * Copyright 2023-2024 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/decoder.h>
12 #include <openssl/err.h>
13 #include <openssl/rand.h>
14 #include "fuzzer.h"
15
16 static ASN1_PCTX *pctx;
17
FuzzerInitialize(int * argc,char *** argv)18 int FuzzerInitialize(int *argc, char ***argv)
19 {
20 FuzzerSetRand();
21
22 OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CRYPTO_STRINGS
23 | OPENSSL_INIT_ADD_ALL_CIPHERS
24 | OPENSSL_INIT_ADD_ALL_DIGESTS,
25 NULL);
26
27 pctx = ASN1_PCTX_new();
28 ASN1_PCTX_set_flags(pctx, ASN1_PCTX_FLAGS_SHOW_ABSENT | ASN1_PCTX_FLAGS_SHOW_SEQUENCE | ASN1_PCTX_FLAGS_SHOW_SSOF | ASN1_PCTX_FLAGS_SHOW_TYPE | ASN1_PCTX_FLAGS_SHOW_FIELD_STRUCT_NAME);
29 ASN1_PCTX_set_str_flags(pctx, ASN1_STRFLGS_UTF8_CONVERT | ASN1_STRFLGS_SHOW_TYPE | ASN1_STRFLGS_DUMP_ALL);
30
31 ERR_clear_error();
32 CRYPTO_free_ex_index(0, -1);
33 return 1;
34 }
35
FuzzerTestOneInput(const uint8_t * buf,size_t len)36 int FuzzerTestOneInput(const uint8_t *buf, size_t len)
37 {
38 OSSL_DECODER_CTX *dctx;
39 EVP_PKEY *pkey = NULL;
40 EVP_PKEY_CTX *ctx = NULL;
41 BIO *bio;
42
43 bio = BIO_new(BIO_s_null());
44 dctx = OSSL_DECODER_CTX_new_for_pkey(&pkey, NULL, NULL, NULL, 0, NULL,
45 NULL);
46 if (dctx == NULL) {
47 return 0;
48 }
49 if (OSSL_DECODER_from_data(dctx, &buf, &len)) {
50 EVP_PKEY *pkey2;
51
52 EVP_PKEY_print_public(bio, pkey, 1, pctx);
53 EVP_PKEY_print_private(bio, pkey, 1, pctx);
54 EVP_PKEY_print_params(bio, pkey, 1, pctx);
55
56 pkey2 = EVP_PKEY_dup(pkey);
57 OPENSSL_assert(pkey2 != NULL);
58 EVP_PKEY_eq(pkey, pkey2);
59 EVP_PKEY_free(pkey2);
60
61 ctx = EVP_PKEY_CTX_new(pkey, NULL);
62 /*
63 * Param check will take too long time on large DH parameters.
64 * Skip it.
65 */
66 if ((!EVP_PKEY_is_a(pkey, "DH") && !EVP_PKEY_is_a(pkey, "DHX"))
67 || EVP_PKEY_get_bits(pkey) <= 2048)
68 EVP_PKEY_param_check(ctx);
69
70 EVP_PKEY_public_check(ctx);
71 /* Private and pairwise checks are unbounded, skip for large keys. */
72 if (EVP_PKEY_get_bits(pkey) <= 4096) {
73 EVP_PKEY_private_check(ctx);
74 EVP_PKEY_pairwise_check(ctx);
75 }
76 OPENSSL_assert(ctx != NULL);
77 EVP_PKEY_CTX_free(ctx);
78 EVP_PKEY_free(pkey);
79 }
80 OSSL_DECODER_CTX_free(dctx);
81
82 BIO_free(bio);
83 ERR_clear_error();
84 return 0;
85 }
86
FuzzerCleanup(void)87 void FuzzerCleanup(void)
88 {
89 ASN1_PCTX_free(pctx);
90 FuzzerClearRand();
91 }
92