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/*
Unix SMB/CIFS implementation.
SMB torture tester - deny mode scanning functions
Copyright (C) Andrew Tridgell 2001
Copyright (C) David Mulder 2019
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 "includes.h"
#include "system/filesys.h"
#include "libcli/smb2/smb2.h"
#include "libcli/smb2/smb2_calls.h"
#include "libcli/security/security.h"
#include "torture/util.h"
#include "torture/smb2/proto.h"
#define MAXIMUM_ALLOWED_FILE "torture_maximum_allowed"
bool torture_smb2_maximum_allowed(struct torture_context *tctx,
struct smb2_tree *tree)
{
struct security_descriptor *sd = NULL, *sd_orig = NULL;
struct smb2_create io = {0};
TALLOC_CTX *mem_ctx = NULL;
struct smb2_handle fnum = {{0}};
int i;
bool ret = true;
NTSTATUS status;
union smb_fileinfo q;
const char *owner_sid = NULL;
bool has_restore_privilege, has_backup_privilege, has_system_security_privilege;
mem_ctx = talloc_init("torture_maximum_allowed");
torture_assert_goto(tctx, mem_ctx != NULL, ret, done,
"talloc allocation failed\n");
if (!torture_setting_bool(tctx, "sacl_support", true))
torture_warning(tctx, "Skipping SACL related tests!\n");
sd = security_descriptor_dacl_create(mem_ctx,
0, NULL, NULL,
SID_NT_AUTHENTICATED_USERS,
SEC_ACE_TYPE_ACCESS_ALLOWED,
SEC_RIGHTS_FILE_READ,
0, NULL);
torture_assert_goto(tctx, sd != NULL, ret, done,
"security descriptor creation failed\n");
/* Blank slate */
smb2_util_unlink(tree, MAXIMUM_ALLOWED_FILE);
/* create initial file with restrictive SD */
io.in.desired_access = SEC_RIGHTS_FILE_ALL;
io.in.file_attributes = FILE_ATTRIBUTE_NORMAL;
io.in.create_disposition = NTCREATEX_DISP_CREATE;
io.in.impersonation_level = NTCREATEX_IMPERSONATION_ANONYMOUS;
io.in.fname = MAXIMUM_ALLOWED_FILE;
io.in.sec_desc = sd;
status = smb2_create(tree, mem_ctx, &io);
torture_assert_ntstatus_ok_goto(tctx, status, ret, done,
talloc_asprintf(tctx, "Incorrect status %s - should be %s\n",
nt_errstr(status), nt_errstr(NT_STATUS_OK)));
fnum = io.out.file.handle;
/* the correct answers for this test depends on whether the
user has restore privileges. To find that out we first need
to know our SID - get it from the owner_sid of the file we
just created */
q.query_secdesc.level = RAW_FILEINFO_SEC_DESC;
q.query_secdesc.in.file.handle = fnum;
q.query_secdesc.in.secinfo_flags = SECINFO_DACL | SECINFO_OWNER;
status = smb2_getinfo_file(tree, tctx, &q);
torture_assert_ntstatus_ok_goto(tctx, status, ret, done,
talloc_asprintf(tctx, "Incorrect status %s - should be %s\n",
nt_errstr(status), nt_errstr(NT_STATUS_OK)));
sd_orig = q.query_secdesc.out.sd;
owner_sid = dom_sid_string(tctx, sd_orig->owner_sid);
status = torture_smb2_check_privilege(tree,
owner_sid,
sec_privilege_name(SEC_PRIV_RESTORE));
has_restore_privilege = NT_STATUS_IS_OK(status);
torture_comment(tctx, "Checked SEC_PRIV_RESTORE for %s - %s\n",
owner_sid,
has_restore_privilege?"Yes":"No");
status = torture_smb2_check_privilege(tree,
owner_sid,
sec_privilege_name(SEC_PRIV_BACKUP));
has_backup_privilege = NT_STATUS_IS_OK(status);
torture_comment(tctx, "Checked SEC_PRIV_BACKUP for %s - %s\n",
owner_sid,
has_backup_privilege?"Yes":"No");
status = torture_smb2_check_privilege(tree,
owner_sid,
sec_privilege_name(SEC_PRIV_SECURITY));
has_system_security_privilege = NT_STATUS_IS_OK(status);
torture_comment(tctx, "Checked SEC_PRIV_SECURITY for %s - %s\n",
owner_sid,
has_system_security_privilege?"Yes":"No");
smb2_util_close(tree, fnum);
for (i = 0; i < 32; i++) {
uint32_t mask = SEC_FLAG_MAXIMUM_ALLOWED | (1u << i);
/*
* SEC_GENERIC_EXECUTE is a complete subset of
* SEC_GENERIC_READ when mapped to specific bits,
* so we need to include it in the basic OK mask.
*/
uint32_t ok_mask = SEC_RIGHTS_FILE_READ | SEC_GENERIC_READ | SEC_GENERIC_EXECUTE |
SEC_STD_DELETE | SEC_STD_WRITE_DAC;
/*
* Now SEC_RIGHTS_PRIV_RESTORE and SEC_RIGHTS_PRIV_BACKUP
* don't include any generic bits (they're used directly
* in the fileserver where the generic bits have already
* been mapped into file specific bits) we need to add the
* generic bits to the ok_mask when we have these privileges.
*/
if (has_restore_privilege) {
ok_mask |= SEC_RIGHTS_PRIV_RESTORE|SEC_GENERIC_WRITE;
}
if (has_backup_privilege) {
ok_mask |= SEC_RIGHTS_PRIV_BACKUP|SEC_GENERIC_READ;
}
if (has_system_security_privilege) {
ok_mask |= SEC_FLAG_SYSTEM_SECURITY;
}
/* Skip all SACL related tests. */
if ((!torture_setting_bool(tctx, "sacl_support", true)) &&
(mask & SEC_FLAG_SYSTEM_SECURITY))
continue;
io = (struct smb2_create){0};
io.in.desired_access = mask;
io.in.file_attributes = FILE_ATTRIBUTE_NORMAL;
io.in.create_disposition = NTCREATEX_DISP_OPEN;
io.in.impersonation_level =
NTCREATEX_IMPERSONATION_ANONYMOUS;
io.in.fname = MAXIMUM_ALLOWED_FILE;
status = smb2_create(tree, mem_ctx, &io);
if (mask & ok_mask ||
mask == SEC_FLAG_MAXIMUM_ALLOWED) {
torture_assert_ntstatus_ok_goto(tctx, status, ret,
done, talloc_asprintf(tctx,
"Incorrect status %s - should be %s\n",
nt_errstr(status), nt_errstr(NT_STATUS_OK)));
} else {
if (mask & SEC_FLAG_SYSTEM_SECURITY) {
torture_assert_ntstatus_equal_goto(tctx,
status, NT_STATUS_PRIVILEGE_NOT_HELD,
ret, done, talloc_asprintf(tctx,
"Incorrect status %s - should be %s\n",
nt_errstr(status),
nt_errstr(NT_STATUS_PRIVILEGE_NOT_HELD)));
} else {
torture_assert_ntstatus_equal_goto(tctx,
status, NT_STATUS_ACCESS_DENIED,
ret, done, talloc_asprintf(tctx,
"Incorrect status %s - should be %s\n",
nt_errstr(status),
nt_errstr(NT_STATUS_ACCESS_DENIED)));
}
}
fnum = io.out.file.handle;
smb2_util_close(tree, fnum);
}
done:
smb2_util_unlink(tree, MAXIMUM_ALLOWED_FILE);
talloc_free(mem_ctx);
return ret;
}
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