summaryrefslogtreecommitdiff
path: root/source3/libsmb/domain_client_validate.c
blob: 69b5739b6348ac7498c3c1e3d50abe7d7aa505c8 (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
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
/* 
   Unix SMB/Netbios implementation.
   Version 1.9.
   Authenticate against a remote domain
   Copyright (C) Andrew Tridgell 1992-1998
   Copyright (C) Andrew Bartlett 2001
   
   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"

extern int DEBUGLEVEL;
extern struct in_addr ipzero;

extern pstring global_myname;

/***********************************************************************
 Connect to a remote machine for domain security authentication
 given a name or IP address.
 ***********************************************************************/

static BOOL connect_to_domain_password_server(struct cli_state *pcli, 
					      char *server, unsigned char *trust_passwd)
{
	struct in_addr dest_ip;
	fstring remote_machine;

	if(cli_initialise(pcli) == NULL) {
		DEBUG(0,("connect_to_domain_password_server: unable to initialize client connection.\n"));
		return False;
	}

	if (is_ipaddress(server)) {
		struct in_addr to_ip;
	  
		/* we shouldn't have 255.255.255.255 forthe IP address of 
		   a password server anyways */
		if ((to_ip.s_addr=inet_addr(server)) == 0xFFFFFFFF) {
			DEBUG (0,("connect_to_domain_password_server: inet_addr(%s) returned 0xFFFFFFFF!\n", server));
			return False;
		}

		if (!name_status_find(0x20, to_ip, remote_machine)) {
			DEBUG(0, ("connect_to_domain_password_server: Can't "
				  "resolve name for IP %s\n", server));
			return False;
		}
	} else {
		fstrcpy(remote_machine, server);
	}

	standard_sub_basic(remote_machine);
	strupper(remote_machine);

	if(!resolve_name( remote_machine, &dest_ip, 0x20)) {
		DEBUG(1,("connect_to_domain_password_server: Can't resolve address for %s\n", remote_machine));
		cli_shutdown(pcli);
		return False;
	}
  
	if (ismyip(dest_ip)) {
		DEBUG(1,("connect_to_domain_password_server: Password server loop - not using password server %s\n",
			 remote_machine));
		cli_shutdown(pcli);
		return False;
	}
  
	if (!cli_connect(pcli, remote_machine, &dest_ip)) {
		DEBUG(0,("connect_to_domain_password_server: unable to connect to SMB server on \
machine %s. Error was : %s.\n", remote_machine, cli_errstr(pcli) ));
		cli_shutdown(pcli);
		return False;
	}
  
	if (!attempt_netbios_session_request(pcli, global_myname, remote_machine, &dest_ip)) {
		DEBUG(0,("connect_to_password_server: machine %s rejected the NetBIOS \
session request. Error was : %s.\n", remote_machine, cli_errstr(pcli) ));
		return False;
	}
  
	pcli->protocol = PROTOCOL_NT1;

	if (!cli_negprot(pcli)) {
		DEBUG(0,("connect_to_domain_password_server: machine %s rejected the negotiate protocol. \
Error was : %s.\n", remote_machine, cli_errstr(pcli) ));
		cli_shutdown(pcli);
		return False;
	}

	if (pcli->protocol != PROTOCOL_NT1) {
		DEBUG(0,("connect_to_domain_password_server: machine %s didn't negotiate NT protocol.\n",
			 remote_machine));
		cli_shutdown(pcli);
		return False;
	}

	/*
	 * Do an anonymous session setup.
	 */

	if (!cli_session_setup(pcli, "", "", 0, "", 0, "")) {
		DEBUG(0,("connect_to_domain_password_server: machine %s rejected the session setup. \
Error was : %s.\n", remote_machine, cli_errstr(pcli) ));
		cli_shutdown(pcli);
		return False;
	}

	if (!(pcli->sec_mode & 1)) {
		DEBUG(1,("connect_to_domain_password_server: machine %s isn't in user level security mode\n",
			 remote_machine));
		cli_shutdown(pcli);
		return False;
	}

	if (!cli_send_tconX(pcli, "IPC$", "IPC", "", 1)) {
		DEBUG(0,("connect_to_domain_password_server: machine %s rejected the tconX on the IPC$ share. \
Error was : %s.\n", remote_machine, cli_errstr(pcli) ));
		cli_shutdown(pcli);
		return False;
	}

	/*
	 * We now have an anonymous connection to IPC$ on the domain password server.
	 */

	/*
	 * Even if the connect succeeds we need to setup the netlogon
	 * pipe here. We do this as we may just have changed the domain
	 * account password on the PDC and yet we may be talking to
	 * a BDC that doesn't have this replicated yet. In this case
	 * a successful connect to a DC needs to take the netlogon connect
	 * into account also. This patch from "Bjart Kvarme" <bjart.kvarme@usit.uio.no>.
	 */

	if(cli_nt_session_open(pcli, PIPE_NETLOGON) == False) {
		DEBUG(0,("connect_to_domain_password_server: unable to open the domain client session to \
machine %s. Error was : %s.\n", remote_machine, cli_errstr(pcli)));
		cli_nt_session_close(pcli);
		cli_ulogoff(pcli);
		cli_shutdown(pcli);
		return False;
	}

	if (cli_nt_setup_creds(pcli, trust_passwd) == False) {
		DEBUG(0,("connect_to_domain_password_server: unable to setup the PDC credentials to machine \
%s. Error was : %s.\n", remote_machine, cli_errstr(pcli)));
		cli_nt_session_close(pcli);
		cli_ulogoff(pcli);
		cli_shutdown(pcli);
		return(False);
	}

	return True;
}

/***********************************************************************
 Utility function to attempt a connection to an IP address of a DC.
************************************************************************/

static BOOL attempt_connect_to_dc(struct cli_state *pcli, struct in_addr *ip, 
				  unsigned char *trust_passwd)
{
	fstring dc_name;

	/*
	 * Ignore addresses we have already tried.
	 */

	if (ip_equal(ipzero, *ip))
		return False;

	if (!lookup_pdc_name(global_myname, lp_workgroup(), ip, dc_name))
		return False;

	return connect_to_domain_password_server(pcli, dc_name, trust_passwd);
}

/***********************************************************************
 We have been asked to dynamcially determine the IP addresses of
 the PDC and BDC's for this DOMAIN, and query them in turn.
************************************************************************/
static BOOL find_connect_pdc(struct cli_state *pcli, 
			     unsigned char *trust_passwd, 
			     time_t last_change_time)
{
	struct in_addr *ip_list = NULL;
	int count = 0;
	int i;
	BOOL connected_ok = False;
	time_t time_now = time(NULL);
	BOOL use_pdc_only = False;

	/*
	 * If the time the machine password has changed
	 * was less than an hour ago then we need to contact
	 * the PDC only, as we cannot be sure domain replication
	 * has yet taken place. Bug found by Gerald (way to go
	 * Gerald !). JRA.
	 */

	if (time_now - last_change_time < 3600)
		use_pdc_only = True;

	if (!get_dc_list(use_pdc_only, lp_workgroup(), &ip_list, &count))
		return False;

	/*
	 * Firstly try and contact a PDC/BDC who has the same
	 * network address as any of our interfaces.
	 */
	for(i = 0; i < count; i++) {
		if(!is_local_net(ip_list[i]))
			continue;

		if((connected_ok = attempt_connect_to_dc(pcli, &ip_list[i], trust_passwd))) 
			break;
		
		ip_list[i] = ipzero; /* Tried and failed. */
	}

	/*
	 * Secondly try and contact a random PDC/BDC.
	 */
	if(!connected_ok) {
		i = (sys_random() % count);

		if (!(connected_ok = attempt_connect_to_dc(pcli, &ip_list[i], trust_passwd)))
			ip_list[i] = ipzero; /* Tried and failed. */
	}

	/*
	 * Finally go through the IP list in turn, ignoring any addresses
	 * we have already tried.
	 */
	if(!connected_ok) {
		/*
		 * Try and connect to any of the other IP addresses in the PDC/BDC list.
		 * Note that from a WINS server the #1 IP address is the PDC.
		 */
		for(i = 0; i < count; i++) {
			if((connected_ok = attempt_connect_to_dc(pcli, &ip_list[i], trust_passwd)))
				break;
		}
	}

	if(ip_list != NULL)
		free((char *)ip_list);


	return connected_ok;
}

/***********************************************************************
 Do the same as security=server, but using NT Domain calls and a session
 key from the machine password.  If the server parameter is specified
 use it, otherwise figure out a server from the 'password server' param.
************************************************************************/

NTSTATUS domain_client_validate(const auth_usersupplied_info *user_info, 
			      auth_serversupplied_info *server_info, 
			      char *server, unsigned char *trust_passwd,
			      time_t last_change_time)
{
	fstring remote_machine;
	NET_ID_INFO_CTR ctr;
	NET_USER_INFO_3 info3;
	struct cli_state cli;
	uint32 smb_uid_low;
	BOOL connected_ok = False;
	NTSTATUS status;

	/* 
	 * Check that the requested domain is not our own machine name.
	 * If it is, we should never check the PDC here, we use our own local
	 * password file.
	 */

	if(strequal(user_info->domain.str, global_myname)) {
		DEBUG(3,("domain_client_validate: Requested domain was for this machine.\n"));
		return NT_STATUS_LOGON_FAILURE;
	}

	/*
	 * At this point, smb_apasswd points to the lanman response to
	 * the challenge in local_challenge, and smb_ntpasswd points to
	 * the NT response to the challenge in local_challenge. Ship
	 * these over the secure channel to a domain controller and
	 * see if they were valid.
	 */

	ZERO_STRUCT(cli);

	while (!connected_ok &&
	       next_token(&server,remote_machine,LIST_SEP,sizeof(remote_machine))) {
		if(strequal(remote_machine, "*")) {
			connected_ok = find_connect_pdc(&cli, trust_passwd, last_change_time);
		} else {
			connected_ok = connect_to_domain_password_server(&cli, remote_machine, trust_passwd);
		}
	}

	if (!connected_ok) {
		DEBUG(0,("domain_client_validate: Domain password server not available.\n"));
		cli_shutdown(&cli);
		return NT_STATUS_LOGON_FAILURE;
	}

	/* We really don't care what LUID we give the user. */
	generate_random_buffer( (unsigned char *)&smb_uid_low, 4, False);

	ZERO_STRUCT(info3);

	if ((status = cli_nt_login_network(&cli, user_info, smb_uid_low, 
                                           &ctr, &info3))
            != NT_STATUS_OK) {
		DEBUG(0,("domain_client_validate: unable to validate password "
                         "for user %s in domain %s to Domain controller %s. "
                         "Error was %s.\n", user_info->smb_username.str,
                         user_info->domain.str, remote_machine, 
                         get_nt_error_msg(status)));
	} else {
		status = NT_STATUS_OK;
	}

	/*
	 * Here, if we really want it, we have lots of info about the user in info3.
	 */

#if 0
	/* 
	 * We don't actually need to do this - plus it fails currently with
	 * NT_STATUS_INVALID_INFO_CLASS - we need to know *exactly* what to
	 * send here. JRA.
	 */

	if (NT_STATUS_IS_OK(status)) {
		if(cli_nt_logoff(&cli, &ctr) == False) {
			DEBUG(0,("domain_client_validate: unable to log off user %s in domain \
%s to Domain controller %s. Error was %s.\n", user, domain, remote_machine, cli_errstr(&cli)));        
			status = NT_STATUS_LOGON_FAILURE;
		}
	}
#endif /* 0 */

	/* Note - once the cli stream is shutdown the mem_ctx used
	   to allocate the other_sids and gids structures has been deleted - so
	   these pointers are no longer valid..... */

	cli_nt_session_close(&cli);
	cli_ulogoff(&cli);
	cli_shutdown(&cli);
	return status;
}