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 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, NULL); 25 26 pctx = ASN1_PCTX_new(); 27 ASN1_PCTX_set_flags(pctx, ASN1_PCTX_FLAGS_SHOW_ABSENT 28 | ASN1_PCTX_FLAGS_SHOW_SEQUENCE 29 | ASN1_PCTX_FLAGS_SHOW_SSOF 30 | ASN1_PCTX_FLAGS_SHOW_TYPE 31 | ASN1_PCTX_FLAGS_SHOW_FIELD_STRUCT_NAME); 32 ASN1_PCTX_set_str_flags(pctx, ASN1_STRFLGS_UTF8_CONVERT 33 | ASN1_STRFLGS_SHOW_TYPE 34 | ASN1_STRFLGS_DUMP_ALL); 35 36 ERR_clear_error(); 37 CRYPTO_free_ex_index(0, -1); 38 return 1; 39 } 40 41 int FuzzerTestOneInput(const uint8_t *buf, size_t len) 42 { 43 OSSL_DECODER_CTX *dctx; 44 EVP_PKEY *pkey = NULL; 45 EVP_PKEY_CTX *ctx = NULL; 46 BIO *bio; 47 48 bio = BIO_new(BIO_s_null()); 49 dctx = OSSL_DECODER_CTX_new_for_pkey(&pkey, NULL, NULL, NULL, 0, NULL, 50 NULL); 51 if (dctx == NULL) { 52 return 0; 53 } 54 if (OSSL_DECODER_from_data(dctx, &buf, &len)) { 55 EVP_PKEY *pkey2; 56 57 EVP_PKEY_print_public(bio, pkey, 1, pctx); 58 EVP_PKEY_print_private(bio, pkey, 1, pctx); 59 EVP_PKEY_print_params(bio, pkey, 1, pctx); 60 61 pkey2 = EVP_PKEY_dup(pkey); 62 OPENSSL_assert(pkey2 != NULL); 63 EVP_PKEY_eq(pkey, pkey2); 64 EVP_PKEY_free(pkey2); 65 66 ctx = EVP_PKEY_CTX_new(pkey, NULL); 67 /* 68 * Param check will take too long time on large DH parameters. 69 * Skip it. 70 */ 71 if ((!EVP_PKEY_is_a(pkey, "DH") && !EVP_PKEY_is_a(pkey, "DHX")) 72 || EVP_PKEY_get_bits(pkey) <= 2048) 73 EVP_PKEY_param_check(ctx); 74 75 EVP_PKEY_public_check(ctx); 76 /* Private and pairwise checks are unbounded, skip for large keys. */ 77 if (EVP_PKEY_get_bits(pkey) <= 4096) { 78 EVP_PKEY_private_check(ctx); 79 EVP_PKEY_pairwise_check(ctx); 80 } 81 OPENSSL_assert(ctx != NULL); 82 EVP_PKEY_CTX_free(ctx); 83 EVP_PKEY_free(pkey); 84 } 85 OSSL_DECODER_CTX_free(dctx); 86 87 BIO_free(bio); 88 ERR_clear_error(); 89 return 0; 90 } 91 92 void FuzzerCleanup(void) 93 { 94 ASN1_PCTX_free(pctx); 95 FuzzerClearRand(); 96 } 97