summaryrefslogtreecommitdiff
path: root/source4/auth/auth_sam.c
blob: fd92f3ae12635d4314b31c1aaa4ebc579006b215 (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
440
441
442
/* 
   Unix SMB/CIFS implementation.
   Password and authentication handling
   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2004
   Copyright (C) Gerald Carter                             2003
   Copyright (C) Stefan Metzmacher                         2005
   
   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 "librpc/gen_ndr/ndr_netlogon.h"
#include "system/time.h"
#include "tdb_wrap.h"
#include "util/util_ldb.h"
#include "lib/ldb/include/ldb.h"
#include "auth/auth.h"
#include "auth/auth_sam.h"
#include "dsdb/samdb/samdb.h"
#include "libcli/security/security.h"
#include "libcli/ldap/ldap.h"
#include "param/param.h"

extern const char *user_attrs[];
extern const char *domain_ref_attrs[];

/****************************************************************************
 Look for the specified user in the sam, return ldb result structures
****************************************************************************/

static NTSTATUS authsam_search_account(TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx,
				       const char *account_name,
				       const char *domain_name,
				       struct ldb_message ***ret_msgs,
				       struct ldb_message ***ret_msgs_domain_ref)
{
	struct ldb_message **msgs_tmp;
	struct ldb_message **msgs;
	struct ldb_message **msgs_domain_ref;
	struct ldb_dn *partitions_basedn = samdb_partitions_dn(sam_ctx, mem_ctx);

	int ret;
	int ret_domain;

	struct ldb_dn *domain_dn = NULL;

	if (domain_name) {
		domain_dn = samdb_domain_to_dn(sam_ctx, mem_ctx, domain_name);
		if (!domain_dn) {
			return NT_STATUS_INTERNAL_DB_CORRUPTION;
		}
	}

	/* pull the user attributes */
	ret = gendb_search(sam_ctx, mem_ctx, domain_dn, &msgs, user_attrs,
			   "(&(sAMAccountName=%s)(objectclass=user))", 
			   ldb_binary_encode_string(mem_ctx, account_name));
	if (ret == -1) {
		return NT_STATUS_INTERNAL_DB_CORRUPTION;
	}

	if (ret == 0) {
		DEBUG(3,("sam_search_user: Couldn't find user [%s\\%s] in samdb, under %s\n", 
			 domain_name, account_name, ldb_dn_get_linearized(domain_dn)));
		return NT_STATUS_NO_SUCH_USER;
	}

	if (ret > 1) {
		DEBUG(0,("Found %d records matching user [%s]\n", ret, account_name));
		return NT_STATUS_INTERNAL_DB_CORRUPTION;
	}

	if (!domain_dn) {
		struct dom_sid *domain_sid;

		domain_sid = samdb_result_sid_prefix(mem_ctx, msgs[0], "objectSid");
		if (!domain_sid) {
			return NT_STATUS_INTERNAL_DB_CORRUPTION;
		}

		/* find the domain's DN */
		ret = gendb_search(sam_ctx, mem_ctx, NULL, &msgs_tmp, NULL,
				   "(&(objectSid=%s)(objectClass=domain))", 
				   ldap_encode_ndr_dom_sid(mem_ctx, domain_sid));
		if (ret == -1) {
			return NT_STATUS_INTERNAL_DB_CORRUPTION;
		}
		
		if (ret == 0) {
			DEBUG(3,("check_sam_security: Couldn't find domain_sid [%s] in passdb file.\n",
				 dom_sid_string(mem_ctx, domain_sid)));
			return NT_STATUS_NO_SUCH_USER;
		}
		
		if (ret > 1) {
			DEBUG(0,("Found %d records matching domain_sid [%s]\n", 
				 ret, dom_sid_string(mem_ctx, domain_sid)));
			return NT_STATUS_INTERNAL_DB_CORRUPTION;
		}

		domain_dn = msgs_tmp[0]->dn;
	}

	ret_domain = gendb_search(sam_ctx, mem_ctx, partitions_basedn, &msgs_domain_ref, domain_ref_attrs,
				  "(nCName=%s)", ldb_dn_get_linearized(domain_dn));
	if (ret_domain == -1) {
		return NT_STATUS_INTERNAL_DB_CORRUPTION;
	}
		
	if (ret_domain == 0) {
		DEBUG(3,("check_sam_security: Couldn't find domain [%s] in passdb file.\n",
			 ldb_dn_get_linearized(msgs_tmp[0]->dn)));
		return NT_STATUS_NO_SUCH_USER;
	}
		
	if (ret_domain > 1) {
		DEBUG(0,("Found %d records matching domain [%s]\n", 
			 ret_domain, ldb_dn_get_linearized(msgs_tmp[0]->dn)));
		return NT_STATUS_INTERNAL_DB_CORRUPTION;
	}

	*ret_msgs = msgs;
	*ret_msgs_domain_ref = msgs_domain_ref;
	
	return NT_STATUS_OK;
}

/****************************************************************************
 Do a specific test for an smb password being correct, given a smb_password and
 the lanman and NT responses.
****************************************************************************/
static NTSTATUS authsam_password_ok(struct auth_context *auth_context,
				    TALLOC_CTX *mem_ctx,
				    uint16_t acct_flags,
				    const struct samr_Password *lm_pwd, 
				    const struct samr_Password *nt_pwd,
				    const struct auth_usersupplied_info *user_info, 
				    DATA_BLOB *user_sess_key, 
				    DATA_BLOB *lm_sess_key)
{
	NTSTATUS status;

	if (acct_flags & ACB_PWNOTREQ) {
		if (lp_null_passwords(global_loadparm)) {
			DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n", 
				 user_info->mapped.account_name));
			return NT_STATUS_OK;
		} else {
			DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n", 
				 user_info->mapped.account_name));
			return NT_STATUS_LOGON_FAILURE;
		}		
	}

	switch (user_info->password_state) {
	case AUTH_PASSWORD_PLAIN: 
	{
		const struct auth_usersupplied_info *user_info_temp;	
		status = encrypt_user_info(mem_ctx, auth_context, 
					   AUTH_PASSWORD_HASH, 
					   user_info, &user_info_temp);
		if (!NT_STATUS_IS_OK(status)) {
			DEBUG(1, ("Failed to convert plaintext password to password HASH: %s\n", nt_errstr(status)));
			return status;
		}
		user_info = user_info_temp;

		/*fall through*/
	}
	case AUTH_PASSWORD_HASH:
		*lm_sess_key = data_blob(NULL, 0);
		*user_sess_key = data_blob(NULL, 0);
		status = hash_password_check(mem_ctx, 
					     user_info->password.hash.lanman,
					     user_info->password.hash.nt,
					     user_info->mapped.account_name,
					     lm_pwd, nt_pwd);
		NT_STATUS_NOT_OK_RETURN(status);
		break;
		
	case AUTH_PASSWORD_RESPONSE:
		status = ntlm_password_check(mem_ctx, user_info->logon_parameters, 
					     &auth_context->challenge.data, 
					     &user_info->password.response.lanman, 
					     &user_info->password.response.nt,
					     user_info->mapped.account_name,
					     user_info->client.account_name, 
					     user_info->client.domain_name, 
					     lm_pwd, nt_pwd,
					     user_sess_key, lm_sess_key);
		NT_STATUS_NOT_OK_RETURN(status);
		break;
	}

	if (user_sess_key && user_sess_key->data) {
		talloc_steal(auth_context, user_sess_key->data);
	}
	if (lm_sess_key && lm_sess_key->data) {
		talloc_steal(auth_context, lm_sess_key->data);
	}

	return NT_STATUS_OK;
}



static NTSTATUS authsam_authenticate(struct auth_context *auth_context, 
				     TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx, 
				     struct ldb_message **msgs,
				     struct ldb_message **msgs_domain_ref,
				     const struct auth_usersupplied_info *user_info, 
				     DATA_BLOB *user_sess_key, DATA_BLOB *lm_sess_key) 
{
	struct samr_Password *lm_pwd, *nt_pwd;
	NTSTATUS nt_status;
	uint16_t acct_flags = samdb_result_acct_flags(msgs[0], "userAccountControl");
	
	/* Quit if the account was locked out. */
	if (acct_flags & ACB_AUTOLOCK) {
		DEBUG(3,("check_sam_security: Account for user %s was locked out.\n", 
			 user_info->mapped.account_name));
		return NT_STATUS_ACCOUNT_LOCKED_OUT;
	}

	/* You can only do an interactive login to normal accounts */
	if (user_info->flags & USER_INFO_INTERACTIVE_LOGON) {
		if (!(acct_flags & ACB_NORMAL)) {
			return NT_STATUS_NO_SUCH_USER;
		}
	}

	nt_status = samdb_result_passwords(mem_ctx, msgs[0], &lm_pwd, &nt_pwd);
	NT_STATUS_NOT_OK_RETURN(nt_status);

	nt_status = authsam_password_ok(auth_context, mem_ctx, 
					acct_flags, lm_pwd, nt_pwd,
					user_info, user_sess_key, lm_sess_key);
	NT_STATUS_NOT_OK_RETURN(nt_status);

	nt_status = authsam_account_ok(mem_ctx, sam_ctx, 
				       user_info->logon_parameters,
				       msgs[0],
				       msgs_domain_ref[0],
				       user_info->workstation_name,
				       user_info->mapped.account_name);

	return nt_status;
}



static NTSTATUS authsam_check_password_internals(struct auth_method_context *ctx,
						 TALLOC_CTX *mem_ctx,
						 const char *domain,
						 const struct auth_usersupplied_info *user_info, 
						 struct auth_serversupplied_info **server_info)
{
	NTSTATUS nt_status;
	const char *account_name = user_info->mapped.account_name;
	struct ldb_message **msgs;
	struct ldb_message **domain_ref_msgs;
	struct ldb_context *sam_ctx;
	DATA_BLOB user_sess_key, lm_sess_key;
	TALLOC_CTX *tmp_ctx;

	if (!account_name || !*account_name) {
		/* 'not for me' */
		return NT_STATUS_NOT_IMPLEMENTED;
	}

	tmp_ctx = talloc_new(mem_ctx);
	if (!tmp_ctx) {
		return NT_STATUS_NO_MEMORY;
	}

	sam_ctx = samdb_connect(tmp_ctx, system_session(mem_ctx));
	if (sam_ctx == NULL) {
		talloc_free(tmp_ctx);
		return NT_STATUS_INVALID_SYSTEM_SERVICE;
	}

	nt_status = authsam_search_account(tmp_ctx, sam_ctx, account_name, domain, &msgs, &domain_ref_msgs);
	if (!NT_STATUS_IS_OK(nt_status)) {
		talloc_free(tmp_ctx);
		return nt_status;
	}

	nt_status = authsam_authenticate(ctx->auth_ctx, tmp_ctx, sam_ctx, msgs, domain_ref_msgs, user_info,
					 &user_sess_key, &lm_sess_key);
	if (!NT_STATUS_IS_OK(nt_status)) {
		talloc_free(tmp_ctx);
		return nt_status;
	}

	nt_status = authsam_make_server_info(tmp_ctx, sam_ctx, msgs[0], domain_ref_msgs[0],
					     user_sess_key, lm_sess_key,
					     server_info);
	if (!NT_STATUS_IS_OK(nt_status)) {
		talloc_free(tmp_ctx);
		return nt_status;
	}

	talloc_steal(mem_ctx, *server_info);
	talloc_free(tmp_ctx);

	return NT_STATUS_OK;
}

static NTSTATUS authsam_ignoredomain_want_check(struct auth_method_context *ctx,
						TALLOC_CTX *mem_ctx,
						const struct auth_usersupplied_info *user_info)
{
	if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
		return NT_STATUS_NOT_IMPLEMENTED;
	}

	return NT_STATUS_OK;
}

static NTSTATUS authsam_ignoredomain_check_password(struct auth_method_context *ctx,
						    TALLOC_CTX *mem_ctx,
						    const struct auth_usersupplied_info *user_info, 
						    struct auth_serversupplied_info **server_info)
{
	return authsam_check_password_internals(ctx, mem_ctx, NULL, user_info, server_info);
}

/****************************************************************************
Check SAM security (above) but with a few extra checks.
****************************************************************************/
static NTSTATUS authsam_want_check(struct auth_method_context *ctx,
				   TALLOC_CTX *mem_ctx,
				   const struct auth_usersupplied_info *user_info)
{
	bool is_local_name, is_my_domain;

	if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
		return NT_STATUS_NOT_IMPLEMENTED;
	}

	is_local_name = lp_is_myname(global_loadparm, 
				  user_info->mapped.domain_name);
	is_my_domain  = lp_is_mydomain(global_loadparm, 
				       user_info->mapped.domain_name); 

	/* check whether or not we service this domain/workgroup name */
	switch (lp_server_role(global_loadparm)) {
		case ROLE_STANDALONE:
			return NT_STATUS_OK;

		case ROLE_DOMAIN_MEMBER:
			if (!is_local_name) {
				DEBUG(6,("authsam_check_password: %s is not one of my local names (DOMAIN_MEMBER)\n",
					user_info->mapped.domain_name));
				return NT_STATUS_NOT_IMPLEMENTED;
			}
			return NT_STATUS_OK;

		case ROLE_DOMAIN_CONTROLLER:
			if (!is_local_name && !is_my_domain) {
				DEBUG(6,("authsam_check_password: %s is not one of my local names or domain name (DC)\n",
					user_info->mapped.domain_name));
				return NT_STATUS_NOT_IMPLEMENTED;
			}
			return NT_STATUS_OK;
	}

	DEBUG(6,("authsam_check_password: lp_server_role() has an undefined value\n"));
	return NT_STATUS_NOT_IMPLEMENTED;
}

/****************************************************************************
Check SAM security (above) but with a few extra checks.
****************************************************************************/
static NTSTATUS authsam_check_password(struct auth_method_context *ctx,
				       TALLOC_CTX *mem_ctx,
				       const struct auth_usersupplied_info *user_info, 
				       struct auth_serversupplied_info **server_info)
{
	const char *domain;

	/* check whether or not we service this domain/workgroup name */
	switch (lp_server_role(global_loadparm)) {
		case ROLE_STANDALONE:
		case ROLE_DOMAIN_MEMBER:
			domain = lp_netbios_name(global_loadparm);
			break;

		case ROLE_DOMAIN_CONTROLLER:
			domain = lp_workgroup(global_loadparm);
			break;

		default:
			return NT_STATUS_NO_SUCH_USER;
	}

	return authsam_check_password_internals(ctx, mem_ctx, domain, user_info, server_info);
}

static const struct auth_operations sam_ignoredomain_ops = {
	.name		= "sam_ignoredomain",
	.get_challenge	= auth_get_challenge_not_implemented,
	.want_check	= authsam_ignoredomain_want_check,
	.check_password	= authsam_ignoredomain_check_password
};

static const struct auth_operations sam_ops = {
	.name		= "sam",
	.get_challenge	= auth_get_challenge_not_implemented,
	.want_check	= authsam_want_check,
	.check_password	= authsam_check_password
};

NTSTATUS auth_sam_init(void)
{
	NTSTATUS ret;

	ret = auth_register(&sam_ops);
	if (!NT_STATUS_IS_OK(ret)) {
		DEBUG(0,("Failed to register 'sam' auth backend!\n"));
		return ret;
	}

	ret = auth_register(&sam_ignoredomain_ops);
	if (!NT_STATUS_IS_OK(ret)) {
		DEBUG(0,("Failed to register 'sam_ignoredomain' auth backend!\n"));
		return ret;
	}

	return ret;
}