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lib/fuzzing: add fuzzer for arbitrary token/sd access checks

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The token and descriptor are stored in NDR format; for this purpose we
add a new IDL struct containing this pair (along with a desired access
mask).

An upcoming commit will show how to collect seeds for this fuzzer.

Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
This commit is contained in:
Douglas Bagnall 2023-07-15 22:49:22 +12:00 committed by Andrew Bartlett
parent 5ad28bd760
commit eb2bed3899
3 changed files with 72 additions and 0 deletions
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60
lib/fuzzing/fuzz_security_token_vs_descriptor.c Normal file
View File

@ -0,0 +1,60 @@
/*
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(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;
}
se_access_check(&p.sd,
&p.token,
p.access_desired,
&access_granted);
end:
talloc_free(mem_ctx);
return 0;
}

6
lib/fuzzing/wscript_build
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@ -132,6 +132,12 @@ bld.SAMBA_BINARY('fuzz_stable_sort_r',
deps='fuzzing stable_sort afl-fuzz-main',
fuzzer=True)
bld.SAMBA_BINARY('fuzz_security_token_vs_descriptor',
source='fuzz_security_token_vs_descriptor.c',
deps='fuzzing samba-security afl-fuzz-main',
fuzzer=True)
# The fuzz_type and fuzz_function parameters make the built
# fuzzer take the same input as ndrdump and so the same that
# could be sent to the client or server as the stub data.

6
librpc/idl/security.idl
View File

@ -678,6 +678,12 @@ interface security
lsa_SystemAccessModeFlags rights_mask;
} security_token;
typedef [public] struct {
security_token token;
security_descriptor sd;
uint32 access_desired;
} security_token_descriptor_fuzzing_pair;
/* This is not yet sent over the network, but is simply defined in IDL */
typedef [public] struct {
uid_t uid;