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/*
* Unix SMB/CIFS implementation.
* Util functions valid in the SMB1 server
*
* Copyright (C) Volker Lendecke 2019
* Copyright by the authors of the functions moved here eventually
*
* 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 "smb1_utils.h"
#include "libcli/security/security.h"
/****************************************************************************
Special FCB or DOS processing in the case of a sharing violation.
Try and find a duplicated file handle.
****************************************************************************/
struct files_struct *fcb_or_dos_open(
struct smb_request *req,
const struct smb_filename *smb_fname,
uint32_t access_mask,
uint32_t create_options,
uint32_t private_flags)
{
struct connection_struct *conn = req->conn;
struct file_id id = vfs_file_id_from_sbuf(conn, &smb_fname->st);
struct files_struct *fsp = NULL, *new_fsp = NULL;
NTSTATUS status;
if ((private_flags &
(NTCREATEX_OPTIONS_PRIVATE_DENY_DOS|
NTCREATEX_OPTIONS_PRIVATE_DENY_FCB))
== 0) {
return NULL;
}
for(fsp = file_find_di_first(conn->sconn, id);
fsp != NULL;
fsp = file_find_di_next(fsp)) {
DBG_DEBUG("Checking file %s, fd = %d, vuid = %"PRIu64", "
"file_pid = %"PRIu16", "
"private_options = 0x%"PRIx32", "
"access_mask = 0x%"PRIx32"\n",
fsp_str_dbg(fsp),
fsp->fh->fd,
fsp->vuid,
fsp->file_pid,
fsp->fh->private_options,
fsp->access_mask);
if (fsp->fh->fd != -1 &&
fsp->vuid == req->vuid &&
fsp->file_pid == req->smbpid &&
(fsp->fh->private_options &
(NTCREATEX_OPTIONS_PRIVATE_DENY_DOS |
NTCREATEX_OPTIONS_PRIVATE_DENY_FCB)) &&
(fsp->access_mask & FILE_WRITE_DATA) &&
strequal(fsp->fsp_name->base_name, smb_fname->base_name) &&
strequal(fsp->fsp_name->stream_name,
smb_fname->stream_name)) {
DBG_DEBUG("file match\n");
break;
}
}
if (fsp == NULL) {
return NULL;
}
/* quite an insane set of semantics ... */
if (is_executable(smb_fname->base_name) &&
(fsp->fh->private_options & NTCREATEX_OPTIONS_PRIVATE_DENY_DOS)) {
DBG_DEBUG("file fail due to is_executable.\n");
return NULL;
}
status = file_new(req, conn, &new_fsp);
if (!NT_STATUS_IS_OK(status)) {
DBG_DEBUG("file_new failed: %s\n", nt_errstr(status));
return NULL;
}
status = dup_file_fsp(
req,
fsp,
access_mask,
create_options,
new_fsp);
if (!NT_STATUS_IS_OK(status)) {
DBG_DEBUG("dup_file_fsp failed: %s\n", nt_errstr(status));
file_free(req, new_fsp);
return NULL;
}
return new_fsp;
}
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