samba-mirror/lib/fuzzing/fuzz_security_token_vs_descriptor.c

/*
  Fuzz a security token and descriptor through an access check
  Copyright (C) Catalyst IT 2023

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 3 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "replace.h"
#include "librpc/gen_ndr/ndr_security.h"
#include "libcli/security/security.h"
#include "fuzzing/fuzzing.h"


int LLVMFuzzerInitialize(int *argc, char ***argv)
{
	return 0;
}


int LLVMFuzzerTestOneInput(const uint8_t *input, size_t len)
{
	TALLOC_CTX *mem_ctx = NULL;
	struct security_token_descriptor_fuzzing_pair p = {0};
	enum ndr_err_code ndr_err;
	uint32_t access_granted;

	DATA_BLOB blob = {
		.data = input,
		.length = len
	};

	mem_ctx = talloc_new(NULL);

	ndr_err = ndr_pull_struct_blob(
		&blob, mem_ctx, &p,
		(ndr_pull_flags_fn_t)ndr_pull_security_token_descriptor_fuzzing_pair);

	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
		goto end;
	}

#ifdef FUZZ_SEC_ACCESS_CHECK_DS
	/*
	 * The sec_access_check_ds() function has two arguments not found in
	 * se_access_check, and also not found in our fuzzing examples.
	 *
	 * One is a struct object_tree, which is used for object ACE types.
	 * The other is a SID, which is used as a default if an ACE lacks a
	 * SID.
	 */
	sec_access_check_ds(&p.sd,
			    &p.token,
			    p.access_desired,
			    &access_granted,
			    NULL,
			    NULL);
#else
	se_access_check(&p.sd,
			&p.token,
			p.access_desired,
			&access_granted);
#endif

end:
	talloc_free(mem_ctx);
	return 0;
}