1 files changed, 121 insertions, 0 deletions
diff --git a/lib/fuzzing/fuzz_sddl_conditional_ace.c b/lib/fuzzing/fuzz_sddl_conditional_ace.c
new file mode 100644
index 0000000..636ebf1
--- /dev/null
+++ b/lib/fuzzing/fuzz_sddl_conditional_ace.c
@@ -0,0 +1,121 @@
+/*
+  Fuzz sddl conditional ace decoding and encoding
+  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 "libcli/security/security.h"
+#include "lib/util/attr.h"
+#include "librpc/gen_ndr/ndr_security.h"
+#include "libcli/security/conditional_ace.h"
+#include "librpc/gen_ndr/conditional_ace.h"
+#include "fuzzing/fuzzing.h"
+
+
+#define MAX_LENGTH (1024 * 1024 - 1)
+static char sddl_string[MAX_LENGTH + 1] = {0};
+
+
+int LLVMFuzzerInitialize(int *argc, char ***argv)
+{
+	return 0;
+}
+
+
+int LLVMFuzzerTestOneInput(const uint8_t *input, size_t len)
+{
+	TALLOC_CTX *mem_ctx = NULL;
+	bool ok;
+	struct ace_condition_script *s1 = NULL;
+	struct ace_condition_script *s2 = NULL;
+	const char *message = NULL;
+	size_t message_offset;
+	const char *resddl = NULL;
+	DATA_BLOB e1, e2, e3;
+	size_t length;
+
+	if (len > MAX_LENGTH) {
+		return 0;
+	}
+
+	memcpy(sddl_string, input, len);
+	sddl_string[len] = '\0';
+
+	mem_ctx = talloc_new(NULL);
+
+	s1 = ace_conditions_compile_sddl(mem_ctx,
+					 ACE_CONDITION_FLAG_ALLOW_DEVICE,
+					 sddl_string,
+					 &message,
+					 &message_offset,
+					 &length);
+	if (s1 == NULL) {
+		/* could assert message is non-empty */
+		TALLOC_FREE(mem_ctx);
+		return 0;
+	}
+
+	ok = conditional_ace_encode_binary(mem_ctx, s1, &e1);
+	if (! ok) {
+		abort();
+	}
+
+	s2 = parse_conditional_ace(mem_ctx, e1);
+	if (s2 == NULL) {
+		abort();
+	}
+
+	ok = conditional_ace_encode_binary(mem_ctx, s2, &e2);
+	if (! ok) {
+		abort();
+	}
+	if (data_blob_cmp(&e1, &e2) != 0) {
+		abort();
+	}
+
+	/*
+	 * We know now the SDDL representation compiles to a valid structure
+	 * that survives a round trip through serialisation.
+	 *
+	 * A remaining question is whether it can be re-rendered as SDDL that
+	 * compiles to the same blob.
+	 */
+	resddl = sddl_from_conditional_ace(mem_ctx, s2);
+	if (resddl == NULL) {
+		abort();
+	}
+
+	s2 = ace_conditions_compile_sddl(mem_ctx,
+					 ACE_CONDITION_FLAG_ALLOW_DEVICE,
+					 resddl,
+					 &message,
+					 &message_offset,
+					 &length);
+	if (s2 == NULL) {
+		abort();
+	}
+
+	ok = conditional_ace_encode_binary(mem_ctx, s2, &e3);
+	if (! ok) {
+		abort();
+	}
+	if (data_blob_cmp(&e1, &e3) != 0) {
+		abort();
+	}
+
+	TALLOC_FREE(mem_ctx);
+	return 0;
+}