| // Copyright 2016 The BoringSSL Authors |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // https://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include <openssl/err.h> |
| #include <openssl/mem.h> |
| #include <openssl/x509.h> |
| |
| #include "../crypto/x509/internal.h" |
| |
| extern "C" int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len) { |
| bssl::UniquePtr<X509> x509(d2i_X509(nullptr, &buf, len)); |
| if (x509 != nullptr) { |
| // Extract the public key. |
| EVP_PKEY_free(X509_get_pubkey(x509.get())); |
| |
| // Fuzz some deferred parsing. |
| x509v3_cache_extensions(x509.get()); |
| |
| // Fuzz every supported extension. |
| for (int i = 0; i < X509_get_ext_count(x509.get()); i++) { |
| const X509_EXTENSION *ext = X509_get_ext(x509.get(), i); |
| void *parsed = X509V3_EXT_d2i(ext); |
| if (parsed != nullptr) { |
| int nid = OBJ_obj2nid(X509_EXTENSION_get_object(ext)); |
| BSSL_CHECK(nid != NID_undef); |
| |
| // Reserialize the extension. This should succeed if we were able to |
| // parse it. |
| // TODO(crbug.com/boringssl/352): Ideally we would also assert that |
| // |new_ext| is identical to |ext|, but our parser is not strict enough. |
| bssl::UniquePtr<X509_EXTENSION> new_ext( |
| X509V3_EXT_i2d(nid, X509_EXTENSION_get_critical(ext), parsed)); |
| BSSL_CHECK(new_ext != nullptr); |
| |
| // This can only fail if |ext| was not a supported type, but then |
| // |X509V3_EXT_d2i| should have failed. |
| BSSL_CHECK(X509V3_EXT_free(nid, parsed)); |
| } |
| } |
| |
| // Reserialize |x509|. This should succeed if we were able to parse it. |
| // TODO(crbug.com/boringssl/352): Ideally we would also assert the output |
| // matches the input, but our parser is not strict enough. |
| uint8_t *der = nullptr; |
| int der_len = i2d_X509(x509.get(), &der); |
| BSSL_CHECK(der_len > 0); |
| OPENSSL_free(der); |
| |
| // Reserialize |x509|'s TBSCertificate without reusing the cached encoding. |
| // TODO(crbug.com/boringssl/352): Ideally we would also assert the output |
| // matches the input TBSCertificate, but our parser is not strict enough. |
| der = nullptr; |
| der_len = i2d_re_X509_tbs(x509.get(), &der); |
| BSSL_CHECK(der_len > 0); |
| OPENSSL_free(der); |
| |
| BIO *bio = BIO_new(BIO_s_mem()); |
| X509_print(bio, x509.get()); |
| BIO_free(bio); |
| } |
| ERR_clear_error(); |
| return 0; |
| } |