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/* Copyright (c) 2016, Google Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
#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;
}
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