summaryrefslogtreecommitdiff
path: root/source4/smb_server/service.c
blob: 8741898a9cbf3a4f5baabf425b9daef471c7f219 (plain)
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
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
/* 
   Unix SMB/CIFS implementation.
   service (connection) handling
   Copyright (C) Andrew Tridgell 1992-2003
   
   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 2 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, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"


/****************************************************************************
 Add a home service. Returns the new service number or -1 if fail.
****************************************************************************/
int add_home_service(const char *service, const char *username, const char *homedir)
{
	int iHomeService;

	if (!service || !homedir)
		return -1;

	if ((iHomeService = lp_servicenumber(HOMES_NAME)) < 0)
		return -1;

	/*
	 * If this is a winbindd provided username, remove
	 * the domain component before adding the service.
	 * Log a warning if the "path=" parameter does not
	 * include any macros.
	 */

	{
		const char *p = strchr(service,*lp_winbind_separator());

		/* We only want the 'user' part of the string */
		if (p) {
			service = p + 1;
		}
	}

	if (!lp_add_home(service, iHomeService, username, homedir)) {
		return -1;
	}
	
	return lp_servicenumber(service);

}


/**
 * Find a service entry. service is always in dos codepage.
 *
 * @param service is modified (to canonical form??)
 **/
static int find_service(const char *service)
{
	int iService;

	iService = lp_servicenumber(service);

	/* If we still don't have a service, attempt to add it as a printer. */
	if (iService == -1) {
		int iPrinterService;

		if ((iPrinterService = lp_servicenumber(PRINTERS_NAME)) >= 0) {
			const char *pszTemp;

			DEBUG(3,("checking whether %s is a valid printer name...\n", service));
			pszTemp = lp_printcapname();
			if ((pszTemp != NULL) && pcap_printername_ok(service, pszTemp)) {
				DEBUG(3,("%s is a valid printer name\n", service));
				DEBUG(3,("adding %s as a printer service\n", service));
				lp_add_printer(service, iPrinterService);
				iService = lp_servicenumber(service);
				if (iService < 0)
					DEBUG(0,("failed to add %s as a printer service!\n", service));
			} else {
				DEBUG(3,("%s is not a valid printer name\n", service));
			}
		}
	}

	/* Check for default vfs service?  Unsure whether to implement this */
	if (iService == -1) {
	}

	/* just possibly it's a default service? */
	if (iService == -1) {
		const char *pdefservice = lp_defaultservice();
		if (pdefservice && *pdefservice && 
		    !strequal(pdefservice,service) &&
		    !strstr(service,"..")) {
			/*
			 * We need to do a local copy here as lp_defaultservice() 
			 * returns one of the rotating lp_string buffers that
			 * could get overwritten by the recursive find_service() call
			 * below. Fix from Josef Hinteregger <joehtg@joehtg.co.at>.
			 */
			pstring defservice;
			pstrcpy(defservice, pdefservice);
			iService = find_service(defservice);
			if (iService >= 0) {
				/* REWRITE: all_string_sub(service, "_","/",0); */
				iService = lp_add_service(service, iService);
			}
		}
	}

	if (iService >= 0 && !VALID_SNUM(iService)) {
		DEBUG(0,("Invalid snum %d for %s\n",iService, service));
		iService = -1;
	}

	if (iService == -1) {
		DEBUG(3,("find_service() failed to find service %s\n", service));
	}

	return iService;
}


/****************************************************************************
  Make a connection, given the snum to connect to, and the vuser of the
  connecting user if appropriate.
****************************************************************************/
static NTSTATUS make_connection_snum(struct smbsrv_request *req,
				     int snum, enum ntvfs_type type,
				     DATA_BLOB password, 
				     const char *dev)
{
	struct smbsrv_tcon *tcon;
	NTSTATUS status;

	tcon = conn_new(req->smb_conn);
	if (!tcon) {
		DEBUG(0,("Couldn't find free connection.\n"));
		return NT_STATUS_INSUFFICIENT_RESOURCES;
	}
	req->tcon = tcon;

	tcon->service = snum;
	tcon->type = type;

	/*
	 * New code to check if there's a share security descripter
	 * added from NT server manager. This is done after the
	 * smb.conf checks are done as we need a uid and token. JRA.
	 *
	 */

	if (!share_access_check(req, tcon, snum, SA_RIGHT_FILE_WRITE_DATA)) {
		if (!share_access_check(req, tcon, snum, SA_RIGHT_FILE_READ_DATA)) {
			/* No access, read or write. */
			DEBUG(0,( "make_connection: connection to %s denied due to security descriptor.\n",
				  lp_servicename(snum)));
			conn_free(req->smb_conn, tcon);
			return NT_STATUS_ACCESS_DENIED;
		} else {
			tcon->read_only = True;
		}
	}

	/* check number of connections */
	if (!claim_connection(tcon,
			      lp_servicename(SNUM(tcon)),
			      lp_max_connections(SNUM(tcon)),
			      False,0)) {
		DEBUG(1,("too many connections - rejected\n"));
		conn_free(req->smb_conn, tcon);
		return NT_STATUS_INSUFFICIENT_RESOURCES;
	}  

	/* init ntvfs function pointers */
	status = ntvfs_init_connection(req);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0, ("ntvfs_init_connection failed for service %s\n", lp_servicename(SNUM(tcon))));
		conn_free(req->smb_conn, tcon);
		return status;
	}
	
	/* Invoke NTVFS connection hook */
	if (tcon->ntvfs_ops->connect) {
		status = tcon->ntvfs_ops->connect(req, lp_servicename(snum));
		if (!NT_STATUS_IS_OK(status)) {
			DEBUG(0,("make_connection: NTVFS make connection failed!\n"));
			conn_free(req->smb_conn, tcon);
			return status;
		}
	}
	
	return NT_STATUS_OK;
}

/****************************************************************************
 Make a connection to a service.
 *
 * @param service 
****************************************************************************/
static NTSTATUS make_connection(struct smbsrv_request *req,
				const char *service, DATA_BLOB password, 
				const char *dev, uint16_t vuid)
{
	int snum;
	enum ntvfs_type type;
	const char *type_str;

	/* the service might be of the form \\SERVER\SHARE. Should we put
	   the server name we get from this somewhere? */
	if (strncmp(service, "\\\\", 2) == 0) {
		char *p = strchr(service+2, '\\');
		if (p) {
			service = p + 1;
		}
	}

	snum = find_service(service);

	if (snum == -1) {
		DEBUG(0,("%s couldn't find service %s\n",
			 sub_get_remote_machine(), service));
		return NT_STATUS_BAD_NETWORK_NAME;
	}

	/* work out what sort of connection this is */
	if (strcmp(lp_fstype(snum), "IPC") == 0) {
		type = NTVFS_IPC;
		type_str = "IPC";
	} else if (lp_print_ok(snum)) {
		type = NTVFS_PRINT;
		type_str = "LPT:";
	} else {
		type = NTVFS_DISK;
		type_str = "A:";
	}

	if (strcmp(dev, "?????") != 0 && strcasecmp(type_str, dev) != 0) {
		/* the client gave us the wrong device type */
		return NT_STATUS_BAD_DEVICE_TYPE;
	}

	return make_connection_snum(req, snum, type, password, dev);
}

/****************************************************************************
close a cnum
****************************************************************************/
void close_cnum(struct smbsrv_tcon *tcon)
{
	DEBUG(3,("%s closed connection to service %s\n",
		 tcon->smb_conn->connection->socket->client_addr, lp_servicename(SNUM(tcon))));

	yield_connection(tcon, lp_servicename(SNUM(tcon)));

	/* tell the ntvfs backend that we are disconnecting */
	tcon->ntvfs_ops->disconnect(tcon);

	conn_free(tcon->smb_conn, tcon);
}



/*
  backend for tree connect call
*/
NTSTATUS tcon_backend(struct smbsrv_request *req, union smb_tcon *con)
{
	NTSTATUS status;
	uint16_t vuid = UID_FIELD_INVALID;

	/* can only do bare tcon in share level security */
	if (req->session == NULL && lp_security() != SEC_SHARE) {
		return NT_STATUS_ACCESS_DENIED;
	}

	if (req->session) {
		vuid = req->session->vuid;
	}

	if (con->generic.level == RAW_TCON_TCON) {
		DATA_BLOB password;
		password = data_blob(con->tcon.in.password, strlen(con->tcon.in.password) + 1);

		status = make_connection(req, con->tcon.in.service, password, con->tcon.in.dev, vuid);
		
		if (!NT_STATUS_IS_OK(status)) {
			return status;
		}

		con->tcon.out.max_xmit = req->smb_conn->negotiate.max_recv;
		con->tcon.out.cnum = req->tcon->cnum;
		
		return status;
	} 

	status = make_connection(req, con->tconx.in.path, con->tconx.in.password, 
				 con->tconx.in.device, vuid);
	if (!NT_STATUS_IS_OK(status)) {
		return status;
	}

	con->tconx.out.cnum = req->tcon->cnum;
	con->tconx.out.dev_type = talloc_strdup(req, req->tcon->dev_type);
	con->tconx.out.fs_type = talloc_strdup(req, req->tcon->fs_type);
	con->tconx.out.options = SMB_SUPPORT_SEARCH_BITS | (lp_csc_policy(req->tcon->service) << 2);
	if (lp_msdfs_root(req->tcon->service) && lp_host_msdfs()) {
		con->tconx.out.options |= SMB_SHARE_IN_DFS;
	}

	return status;
}