1 files changed, 78 insertions, 0 deletions
diff --git a/lib/fuzzing/fuzz_security_token_vs_descriptor.c b/lib/fuzzing/fuzz_security_token_vs_descriptor.c
new file mode 100644
index 0000000..f9b2552
--- /dev/null
+++ b/lib/fuzzing/fuzz_security_token_vs_descriptor.c
@@ -0,0 +1,78 @@
+/*
+  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;
+}