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/*
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;
}
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