summaryrefslogtreecommitdiffstats
path: root/source3/auth/auth_domain.c
blob: 266851b22923a235a0a66fbd7612383ceafce798 (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
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
/* 
   Unix SMB/CIFS implementation.
   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"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_AUTH

extern BOOL global_machine_password_needs_changing;

/**
 * Connect to a remote server for (inter)domain security authenticaion.
 *
 * @param cli the cli to return containing the active connection
 * @param server either a machine name or text IP address to
 *               connect to.
 * @param setup_creds_as domain account to setup credentials as
 * @param sec_chan a switch value to distinguish between domain
 *                 member and interdomain authentication
 * @param trust_passwd the trust password to establish the
 *                     credentials with.
 *
 **/

static NTSTATUS connect_to_domain_password_server(struct cli_state **cli,
						const char *domain,
						const char *dc_name,
						struct in_addr dc_ip, 
						struct rpc_pipe_client **pipe_ret,
						BOOL *retry)
{
        NTSTATUS result;
	struct rpc_pipe_client *netlogon_pipe = NULL;

	*pipe_ret = NULL;

	/* TODO: Send a SAMLOGON request to determine whether this is a valid
	   logonserver.  We can avoid a 30-second timeout if the DC is down
	   if the SAMLOGON request fails as it is only over UDP. */

	/* we use a mutex to prevent two connections at once - when a 
	   Win2k PDC get two connections where one hasn't completed a 
	   session setup yet it will send a TCP reset to the first 
	   connection (tridge) */

	/*
	 * With NT4.x DC's *all* authentication must be serialized to avoid
	 * ACCESS_DENIED errors if 2 auths are done from the same machine. JRA.
	 */

	if (!grab_server_mutex(dc_name)) {
		return NT_STATUS_NO_LOGON_SERVERS;
	}
	
	/* Attempt connection */
	*retry = True;
	result = cli_full_connection(cli, global_myname(), dc_name, &dc_ip, 0, 
		"IPC$", "IPC", "", "", "", 0, Undefined, retry);

	if (!NT_STATUS_IS_OK(result)) {
		/* map to something more useful */
		if (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)) {
			result = NT_STATUS_NO_LOGON_SERVERS;
		}

		release_server_mutex();
		return result;
	}

	/*
	 * 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>.
	 */

	/* open the netlogon pipe. */
	if (lp_client_schannel()) {
		/* We also setup the creds chain in the open_schannel call. */
		netlogon_pipe = cli_rpc_pipe_open_schannel(*cli, PI_NETLOGON,
					PIPE_AUTH_LEVEL_PRIVACY, domain, &result);
	} else {
		netlogon_pipe = cli_rpc_pipe_open_noauth(*cli, PI_NETLOGON, &result);
	}

	if(!netlogon_pipe) {
		DEBUG(0,("connect_to_domain_password_server: unable to open the domain client session to \
machine %s. Error was : %s.\n", dc_name, nt_errstr(result)));
		cli_shutdown(*cli);
		release_server_mutex();
		return result;
	}

	if (!lp_client_schannel()) {
		/* We need to set up a creds chain on an unauthenticated netlogon pipe. */
		uint32 neg_flags = NETLOGON_NEG_AUTH2_FLAGS;
		uint32 sec_chan_type = 0;
		unsigned char machine_pwd[16];

		if (!get_trust_pw(domain, machine_pwd, &sec_chan_type)) {
			DEBUG(0, ("connect_to_domain_password_server: could not fetch "
			"trust account password for domain '%s'\n",
				domain));
			cli_shutdown(*cli);
			release_server_mutex();
			return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
		}

		result = rpccli_netlogon_setup_creds(netlogon_pipe,
					dc_name, /* server name */
					domain, /* domain */
					global_myname(), /* client name */
					global_myname(), /* machine account name */
					machine_pwd,
					sec_chan_type,
					&neg_flags);

		if (!NT_STATUS_IS_OK(result)) {
			cli_shutdown(*cli);
			release_server_mutex();
			return result;
		}
	}

	if(!netlogon_pipe) {
		DEBUG(0,("connect_to_domain_password_server: unable to open the domain client session to \
machine %s. Error was : %s.\n", dc_name, cli_errstr(*cli)));
		cli_shutdown(*cli);
		release_server_mutex();
		return NT_STATUS_NO_LOGON_SERVERS;
	}

	/* We exit here with the mutex *locked*. JRA */

	*pipe_ret = netlogon_pipe;

	return NT_STATUS_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.
************************************************************************/

static NTSTATUS domain_client_validate(TALLOC_CTX *mem_ctx,
					const auth_usersupplied_info *user_info, 
					const char *domain,
					uchar chal[8],
					auth_serversupplied_info **server_info, 
					const char *dc_name,
					struct in_addr dc_ip)

{
	NET_USER_INFO_3 info3;
	struct cli_state *cli = NULL;
	struct rpc_pipe_client *netlogon_pipe = NULL;
	NTSTATUS nt_status = NT_STATUS_NO_LOGON_SERVERS;
	int i;
	BOOL retry = True;

	/*
	 * 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.
	 */

	/* rety loop for robustness */
	
	for (i = 0; !NT_STATUS_IS_OK(nt_status) && retry && (i < 3); i++) {
		nt_status = connect_to_domain_password_server(&cli,
							domain,
							dc_name,
							dc_ip,
							&netlogon_pipe,
							&retry);
	}

	if ( !NT_STATUS_IS_OK(nt_status) ) {
		DEBUG(0,("domain_client_validate: Domain password server not available.\n"));
		if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCESS_DENIED)) {
			return NT_STATUS_TRUSTED_RELATIONSHIP_FAILURE;
		}
		return nt_status;
	}

	ZERO_STRUCT(info3);

        /*
         * If this call succeeds, we now have lots of info about the user
         * in the info3 structure.  
         */

	nt_status = rpccli_netlogon_sam_network_logon(netlogon_pipe,
						      mem_ctx,
						      user_info->logon_parameters,/* flags such as 'allow workstation logon' */ 
						      dc_name,                    /* server name */
						      user_info->smb_name.str,    /* user name logging on. */
						      user_info->domain.str,      /* domain name */
						      user_info->wksta_name.str,  /* workstation name */
						      chal,                       /* 8 byte challenge. */
						      user_info->lm_resp,         /* lanman 24 byte response */
						      user_info->nt_resp,         /* nt 24 byte response */
						      &info3);                    /* info3 out */

	/* Let go as soon as possible so we avoid any potential deadlocks
	   with winbind lookup up users or groups. */
	   
	release_server_mutex();

	if (!NT_STATUS_IS_OK(nt_status)) {
		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_name.str,
                         user_info->domain.str, dc_name, 
                         nt_errstr(nt_status)));

		/* map to something more useful */
		if (NT_STATUS_EQUAL(nt_status, NT_STATUS_UNSUCCESSFUL)) {
			nt_status = NT_STATUS_NO_LOGON_SERVERS;
		}
	} else {
		nt_status = make_server_info_info3(mem_ctx,
						user_info->internal_username.str, 
						user_info->smb_name.str,
						domain,
						server_info,
						&info3);

		netsamlogon_cache_store( user_info->smb_name.str, &info3 );
	}

	/* 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_shutdown(cli);
	return nt_status;
}

/****************************************************************************
 Check for a valid username and password in security=domain mode.
****************************************************************************/

static NTSTATUS check_ntdomain_security(const struct auth_context *auth_context,
					void *my_private_data, 
					TALLOC_CTX *mem_ctx,
					const auth_usersupplied_info *user_info, 
					auth_serversupplied_info **server_info)
{
	NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
	const char *domain = lp_workgroup();
	fstring dc_name;
	struct in_addr dc_ip;

	if ( lp_server_role() != ROLE_DOMAIN_MEMBER ) {
		DEBUG(0,("check_ntdomain_security: Configuration error!  Cannot use "
			"ntdomain auth method when not a member of a domain.\n"));
		return NT_STATUS_NOT_IMPLEMENTED;
	}

	if (!user_info || !server_info || !auth_context) {
		DEBUG(1,("check_ntdomain_security: Critical variables not present.  Failing.\n"));
		return NT_STATUS_INVALID_PARAMETER;
	}

	/* 
	 * 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(get_global_sam_name(), user_info->domain.str)) {
		DEBUG(3,("check_ntdomain_security: Requested domain was for this machine.\n"));
		return NT_STATUS_NOT_IMPLEMENTED;
	}

	/* we need our DC to send the net_sam_logon() request to */

	if ( !get_dc_name(domain, NULL, dc_name, &dc_ip) ) {
		DEBUG(5,("check_ntdomain_security: unable to locate a DC for domain %s\n",
			user_info->domain.str));
		return NT_STATUS_NO_LOGON_SERVERS;
	}
	
	nt_status = domain_client_validate(mem_ctx,
					user_info,
					domain,
					(uchar *)auth_context->challenge.data,
					server_info,
					dc_name,
					dc_ip);
		
	return nt_status;
}

/* module initialisation */
static NTSTATUS auth_init_ntdomain(struct auth_context *auth_context, const char* param, auth_methods **auth_method) 
{
	if (!make_auth_methods(auth_context, auth_method)) {
		return NT_STATUS_NO_MEMORY;
	}

	(*auth_method)->name = "ntdomain";
	(*auth_method)->auth = check_ntdomain_security;
	return NT_STATUS_OK;
}


/****************************************************************************
 Check for a valid username and password in a trusted domain
****************************************************************************/

static NTSTATUS check_trustdomain_security(const struct auth_context *auth_context,
					   void *my_private_data, 
					   TALLOC_CTX *mem_ctx,
					   const auth_usersupplied_info *user_info, 
					   auth_serversupplied_info **server_info)
{
	NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
	unsigned char trust_md4_password[16];
	char *trust_password;
	time_t last_change_time;
	DOM_SID sid;
	fstring dc_name;
	struct in_addr dc_ip;

	if (!user_info || !server_info || !auth_context) {
		DEBUG(1,("check_trustdomain_security: Critical variables not present.  Failing.\n"));
		return NT_STATUS_INVALID_PARAMETER;
	}

	/* 
	 * Check that the requested domain is not our own machine name or domain name.
	 */

	if( strequal(get_global_sam_name(), user_info->domain.str)) {
		DEBUG(3,("check_trustdomain_security: Requested domain [%s] was for this machine.\n",
			user_info->domain.str));
		return NT_STATUS_NOT_IMPLEMENTED;
	}

	/* No point is bothering if this is not a trusted domain.
	   This return makes "map to guest = bad user" work again.
	   The logic is that if we know nothing about the domain, that
	   user is not known to us and does not exist */
	
	if ( !is_trusted_domain( user_info->domain.str ) )
		return NT_STATUS_NOT_IMPLEMENTED;

	/*
	 * Get the trusted account password for the trusted domain
	 * No need to become_root() as secrets_init() is done at startup.
	 */

	if (!secrets_fetch_trusted_domain_password(user_info->domain.str, &trust_password,
				&sid, &last_change_time)) {
		DEBUG(0, ("check_trustdomain_security: could not fetch trust account password for domain %s\n", user_info->domain.str));
		return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
	}

#ifdef DEBUG_PASSWORD
	DEBUG(100, ("Trust password for domain %s is %s\n", user_info->domain.str, trust_password));
#endif
	E_md4hash(trust_password, trust_md4_password);
	SAFE_FREE(trust_password);

#if 0
	/* Test if machine password is expired and need to be changed */
	if (time(NULL) > last_change_time + lp_machine_password_timeout())
	{
		global_machine_password_needs_changing = True;
	}
#endif

	/* use get_dc_name() for consistency even through we know that it will be 
	   a netbios name */
	   
	if ( !get_dc_name(user_info->domain.str, NULL, dc_name, &dc_ip) ) {
		DEBUG(5,("check_trustdomain_security: unable to locate a DC for domain %s\n",
			user_info->domain.str));
		return NT_STATUS_NO_LOGON_SERVERS;
	}
	
	nt_status = domain_client_validate(mem_ctx,
					user_info,
					user_info->domain.str,
					(uchar *)auth_context->challenge.data,
					server_info,
					dc_name,
					dc_ip);

	return nt_status;
}

/* module initialisation */
static NTSTATUS auth_init_trustdomain(struct auth_context *auth_context, const char* param, auth_methods **auth_method) 
{
	if (!make_auth_methods(auth_context, auth_method)) {
		return NT_STATUS_NO_MEMORY;
	}

	(*auth_method)->name = "trustdomain";
	(*auth_method)->auth = check_trustdomain_security;
	return NT_STATUS_OK;
}

NTSTATUS auth_domain_init(void) 
{
	smb_register_auth(AUTH_INTERFACE_VERSION, "trustdomain", auth_init_trustdomain);
	smb_register_auth(AUTH_INTERFACE_VERSION, "ntdomain", auth_init_ntdomain);
	return NT_STATUS_OK;
}