1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
|
/*
Unix SMB/CIFS implementation.
service (connection) opening and closing
Copyright (C) Andrew Tridgell 1992-1998
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 "system/passwd.h" /* uid_wrapper */
#include "../lib/tsocket/tsocket.h"
#include "smbd/smbd.h"
#include "smbd/globals.h"
#include "../librpc/gen_ndr/netlogon.h"
#include "../libcli/security/security.h"
#include "printing/pcap.h"
#include "passdb/lookup_sid.h"
#include "auth.h"
#include "../auth/auth_util.h"
#include "lib/param/loadparm.h"
#include "messages.h"
#include "lib/afs/afs_funcs.h"
#include "lib/util_path.h"
#include "lib/util/string_wrappers.h"
#include "source3/lib/substitute.h"
/****************************************************************************
Make a connection to a service from SMB1. Internal interface.
****************************************************************************/
static connection_struct *make_connection_smb1(struct smb_request *req,
NTTIME now,
int snum,
const char *pdev,
NTSTATUS *pstatus)
{
const struct loadparm_substitution *lp_sub =
loadparm_s3_global_substitution();
uint32_t session_global_id;
char *share_name = NULL;
struct smbXsrv_tcon *tcon;
NTSTATUS status;
struct connection_struct *conn;
session_global_id = req->session->global->session_global_id;
share_name = lp_servicename(talloc_tos(), lp_sub, snum);
if (share_name == NULL) {
*pstatus = NT_STATUS_NO_MEMORY;
return NULL;
}
if ((lp_max_connections(snum) > 0)
&& (count_current_connections(lp_const_servicename(snum), true) >=
lp_max_connections(snum))) {
DBG_WARNING("Max connections (%d) exceeded for [%s][%s]\n",
lp_max_connections(snum),
lp_const_servicename(snum), share_name);
TALLOC_FREE(share_name);
*pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
return NULL;
}
status = smb1srv_tcon_create(req->xconn,
session_global_id,
share_name,
now, &tcon);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("make_connection_smb1: Couldn't find free tcon for [%s] - %s\n",
share_name, nt_errstr(status)));
TALLOC_FREE(share_name);
*pstatus = status;
return NULL;
}
TALLOC_FREE(share_name);
conn = conn_new(req->sconn);
if (!conn) {
TALLOC_FREE(tcon);
DEBUG(0,("make_connection_smb1: Couldn't find free connection.\n"));
*pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
return NULL;
}
conn->cnum = tcon->global->tcon_wire_id;
conn->tcon = tcon;
*pstatus = make_connection_snum(req->xconn,
conn,
snum,
req->session,
pdev);
if (!NT_STATUS_IS_OK(*pstatus)) {
conn_free(conn);
TALLOC_FREE(tcon);
return NULL;
}
tcon->compat = talloc_move(tcon, &conn);
tcon->status = NT_STATUS_OK;
*pstatus = NT_STATUS_OK;
return tcon->compat;
}
/****************************************************************************
Make a connection to a service. External SMB1 interface.
*
* @param service
****************************************************************************/
connection_struct *make_connection(struct smb_request *req,
NTTIME now,
const char *service_in,
const char *pdev, uint64_t vuid,
NTSTATUS *status)
{
struct smbd_server_connection *sconn = req->sconn;
struct smbXsrv_session *session = req->session;
const struct loadparm_substitution *lp_sub =
loadparm_s3_global_substitution();
uid_t euid;
char *service = NULL;
fstring dev;
int snum = -1;
fstrcpy(dev, pdev);
/* This must ONLY BE CALLED AS ROOT. As it exits this function as
* root. */
if (!non_root_mode() && (euid = geteuid()) != 0) {
DEBUG(0,("make_connection: PANIC ERROR. Called as nonroot "
"(%u)\n", (unsigned int)euid ));
smb_panic("make_connection: PANIC ERROR. Called as nonroot\n");
}
if (conn_num_open(sconn) > 2047) {
*status = NT_STATUS_INSUFF_SERVER_RESOURCES;
return NULL;
}
if (session == NULL) {
DEBUG(1,("make_connection: refusing to connect with "
"no session setup\n"));
*status = NT_STATUS_ACCESS_DENIED;
return NULL;
}
/* Logic to try and connect to the correct [homes] share, preferably
without too many getpwnam() lookups. This is particularly nasty for
winbind usernames, where the share name isn't the same as unix
username.
*/
if (strequal(service_in,HOMES_NAME)) {
if (session->homes_snum == -1) {
DEBUG(2, ("[homes] share not available for "
"this user because it was not found "
"or created at session setup "
"time\n"));
*status = NT_STATUS_BAD_NETWORK_NAME;
return NULL;
}
DEBUG(5, ("making a connection to [homes] service "
"created at session setup time\n"));
return make_connection_smb1(req, now,
session->homes_snum,
dev, status);
} else if ((session->homes_snum != -1)
&& strequal(service_in,
lp_const_servicename(session->homes_snum))) {
DEBUG(5, ("making a connection to 'homes' service [%s] "
"created at session setup time\n", service_in));
return make_connection_smb1(req, now,
session->homes_snum,
dev, status);
}
service = talloc_strdup(talloc_tos(), service_in);
if (!service) {
*status = NT_STATUS_NO_MEMORY;
return NULL;
}
if (!strlower_m(service)) {
DEBUG(2, ("strlower_m %s failed\n", service));
*status = NT_STATUS_INVALID_PARAMETER;
return NULL;
}
snum = find_service(talloc_tos(), service, &service);
if (!service) {
*status = NT_STATUS_NO_MEMORY;
return NULL;
}
if (snum < 0) {
if (strequal(service,"IPC$") ||
(lp_enable_asu_support() && strequal(service,"ADMIN$"))) {
DEBUG(3,("refusing IPC connection to %s\n", service));
*status = NT_STATUS_ACCESS_DENIED;
return NULL;
}
DEBUG(3,("%s (%s) couldn't find service %s\n",
get_remote_machine_name(),
tsocket_address_string(
sconn->remote_address, talloc_tos()),
service));
*status = NT_STATUS_BAD_NETWORK_NAME;
return NULL;
}
/* Handle non-Dfs clients attempting connections to msdfs proxy */
if (lp_host_msdfs() && (*lp_msdfs_proxy(talloc_tos(), lp_sub, snum) != '\0')) {
DEBUG(3, ("refusing connection to dfs proxy share '%s' "
"(pointing to %s)\n",
service, lp_msdfs_proxy(talloc_tos(), lp_sub, snum)));
*status = NT_STATUS_BAD_NETWORK_NAME;
return NULL;
}
DEBUG(5, ("making a connection to 'normal' service %s\n", service));
return make_connection_smb1(req, now, snum,
dev, status);
}
|
