1 /*
2 * Unix SMB/CIFS implementation.
3 * Util functions valid in the SMB1 server
4 *
5 * Copyright (C) Volker Lendecke 2019
6 * Copyright by the authors of the functions moved here eventually
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 3 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #include "includes.h"
23 #include "smb1_utils.h"
24 #include "libcli/security/security.h"
25
26 /****************************************************************************
27 Special FCB or DOS processing in the case of a sharing violation.
28 Try and find a duplicated file handle.
29 ****************************************************************************/
30
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)31 struct files_struct *fcb_or_dos_open(
32 struct smb_request *req,
33 const struct smb_filename *smb_fname,
34 uint32_t access_mask,
35 uint32_t create_options,
36 uint32_t private_flags)
37 {
38 struct connection_struct *conn = req->conn;
39 struct file_id id = vfs_file_id_from_sbuf(conn, &smb_fname->st);
40 struct files_struct *fsp = NULL, *new_fsp = NULL;
41 NTSTATUS status;
42
43 if ((private_flags &
44 (NTCREATEX_OPTIONS_PRIVATE_DENY_DOS|
45 NTCREATEX_OPTIONS_PRIVATE_DENY_FCB))
46 == 0) {
47 return NULL;
48 }
49
50 for(fsp = file_find_di_first(conn->sconn, id);
51 fsp != NULL;
52 fsp = file_find_di_next(fsp)) {
53
54 DBG_DEBUG("Checking file %s, fd = %d, vuid = %"PRIu64", "
55 "file_pid = %"PRIu16", "
56 "private_options = 0x%"PRIx32", "
57 "access_mask = 0x%"PRIx32"\n",
58 fsp_str_dbg(fsp),
59 fsp->fh->fd,
60 fsp->vuid,
61 fsp->file_pid,
62 fsp->fh->private_options,
63 fsp->access_mask);
64
65 if (fsp->fh->fd != -1 &&
66 fsp->vuid == req->vuid &&
67 fsp->file_pid == req->smbpid &&
68 (fsp->fh->private_options &
69 (NTCREATEX_OPTIONS_PRIVATE_DENY_DOS |
70 NTCREATEX_OPTIONS_PRIVATE_DENY_FCB)) &&
71 (fsp->access_mask & FILE_WRITE_DATA) &&
72 strequal(fsp->fsp_name->base_name, smb_fname->base_name) &&
73 strequal(fsp->fsp_name->stream_name,
74 smb_fname->stream_name)) {
75 DBG_DEBUG("file match\n");
76 break;
77 }
78 }
79
80 if (fsp == NULL) {
81 return NULL;
82 }
83
84 /* quite an insane set of semantics ... */
85 if (is_executable(smb_fname->base_name) &&
86 (fsp->fh->private_options & NTCREATEX_OPTIONS_PRIVATE_DENY_DOS)) {
87 DBG_DEBUG("file fail due to is_executable.\n");
88 return NULL;
89 }
90
91 status = file_new(req, conn, &new_fsp);
92 if (!NT_STATUS_IS_OK(status)) {
93 DBG_DEBUG("file_new failed: %s\n", nt_errstr(status));
94 return NULL;
95 }
96
97 status = dup_file_fsp(
98 req,
99 fsp,
100 access_mask,
101 create_options,
102 new_fsp);
103
104 if (!NT_STATUS_IS_OK(status)) {
105 DBG_DEBUG("dup_file_fsp failed: %s\n", nt_errstr(status));
106 file_free(req, new_fsp);
107 return NULL;
108 }
109
110 return new_fsp;
111 }
112