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/*
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 particulary 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);
}
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