summaryrefslogtreecommitdiff
path: root/source3/nsswitch/winbindd_pam.c
blob: 75e10eb405ada4109c1cdb8649391f5d86068ea6 (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
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
/*
   Unix SMB/CIFS implementation.

   Winbind daemon - pam auth funcions

   Copyright (C) Andrew Tridgell 2000
   Copyright (C) Tim Potter 2001
   Copyright (C) Andrew Bartlett 2001-2002
   
   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 "winbindd.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_WINBIND


static NTSTATUS append_info3_as_ndr(TALLOC_CTX *mem_ctx, 
				    struct winbindd_cli_state *state, 
				    NET_USER_INFO_3 *info3) 
{
	prs_struct ps;
	uint32 size;
	if (!prs_init(&ps, 256 /* Random, non-zero number */, mem_ctx, MARSHALL)) {
		return NT_STATUS_NO_MEMORY;
	}
	if (!net_io_user_info3("", info3, &ps, 1, 3)) {
		prs_mem_free(&ps);
		return NT_STATUS_UNSUCCESSFUL;
	}

	size = prs_data_size(&ps);
	state->response.extra_data = malloc(size);
	if (!state->response.extra_data) {
		prs_mem_free(&ps);
		return NT_STATUS_NO_MEMORY;
	}
	prs_copy_all_data_out(state->response.extra_data, &ps);
	state->response.length += size;
	prs_mem_free(&ps);
	return NT_STATUS_OK;
}

/*******************************************************************
 wrapper around retreiving the trsut account password 
*******************************************************************/

static BOOL get_trust_pw(const char *domain, uint8 ret_pwd[16],
                          time_t *pass_last_set_time, uint32 *channel)
{
	DOM_SID sid;
	char *pwd;

	if ( lp_server_role()==ROLE_DOMAIN_MEMBER || strequal(domain, lp_workgroup()) ) 
	{
		/*
		 * Get the machine account password for the domain to contact.
		 * This is either our own domain for a workstation, or possibly
		 * any domain for a PDC with trusted domains.
		 */

		if ( !secrets_fetch_trust_account_password (domain, ret_pwd,
			pass_last_set_time, channel) ) 
		{
			DEBUG(0, ("get_trust_pw: could not fetch trust account "
				  "password for my domain %s\n", domain));
			return False;
		}
		
		return True;
	}
	else if ( lp_allow_trusted_domains() ) 
	{
		/* if we are not a domain member, then we must be a DC and 
		   this must be a trusted domain */

		if ( !secrets_fetch_trusted_domain_password(domain, &pwd, &sid, 
			pass_last_set_time) ) 
		{
			DEBUG(0, ("get_trust_pw: could not fetch trust account "
				  "password for trusted domain %s\n", domain));
			return False;
		}
		
		*channel = SEC_CHAN_DOMAIN;
		E_md4hash(pwd, ret_pwd);
		SAFE_FREE(pwd);

		return True;
	}
	
	/* Failure */
	return False;
}

/**********************************************************************
 Authenticate a user with a clear test password
**********************************************************************/

enum winbindd_result winbindd_pam_auth(struct winbindd_cli_state *state) 
{
	NTSTATUS result;
	fstring name_domain, name_user;
	unsigned char trust_passwd[16];
	time_t last_change_time;
	uint32 sec_channel_type;
        NET_USER_INFO_3 info3;
        struct cli_state *cli = NULL;
	uchar chal[8];
	TALLOC_CTX *mem_ctx = NULL;
	DATA_BLOB lm_resp;
	DATA_BLOB nt_resp;
	DOM_CRED ret_creds;
	int attempts = 0;
	unsigned char local_lm_response[24];
	unsigned char local_nt_response[24];

	/* Ensure null termination */
	state->request.data.auth.user[sizeof(state->request.data.auth.user)-1]='\0';

	/* Ensure null termination */
	state->request.data.auth.pass[sizeof(state->request.data.auth.pass)-1]='\0';

	DEBUG(3, ("[%5d]: pam auth %s\n", state->pid,
		  state->request.data.auth.user));

	if (!(mem_ctx = talloc_init("winbind pam auth for %s", state->request.data.auth.user))) {
		DEBUG(0, ("winbindd_pam_auth: could not talloc_init()!\n"));
		result = NT_STATUS_NO_MEMORY;
		goto done;
	}

	/* Parse domain and username */
	
	if (!parse_domain_user(state->request.data.auth.user, name_domain, 
			       name_user)) {
		DEBUG(5,("no domain separator (%s) in username (%s) - failing auth\n", lp_winbind_separator(), state->request.data.auth.user));
		result = NT_STATUS_INVALID_PARAMETER;
		goto done;
	}

	/* do password magic */
	
	generate_random_buffer(chal, 8, False);
	SMBencrypt(state->request.data.auth.pass, chal, local_lm_response);
		
	SMBNTencrypt(state->request.data.auth.pass, chal, local_nt_response);

	lm_resp = data_blob_talloc(mem_ctx, local_lm_response, sizeof(local_lm_response));
	nt_resp = data_blob_talloc(mem_ctx, local_nt_response, sizeof(local_nt_response));
	
	if ( !get_trust_pw(name_domain, trust_passwd, &last_change_time, &sec_channel_type) ) {
		result = NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
		goto done;
	}

	/* check authentication loop */

	do {
		ZERO_STRUCT(info3);
		ZERO_STRUCT(ret_creds);
	
		/* Don't shut this down - it belongs to the connection cache code */
		result = cm_get_netlogon_cli(name_domain, trust_passwd, 
					     sec_channel_type, False, &cli);

		if (!NT_STATUS_IS_OK(result)) {
			DEBUG(3, ("could not open handle to NETLOGON pipe\n"));
			goto done;
		}

		result = cli_netlogon_sam_network_logon(cli, mem_ctx,
							&ret_creds,
							name_user, name_domain, 
							global_myname(), chal, 
							lm_resp, nt_resp,
							&info3);
		attempts += 1;
		
		/* if we get access denied, a possible cuase was that we had and open
		   connection to the DC, but someone changed our machine accoutn password
		   out from underneath us using 'net rpc changetrustpw' */
		   
		if ( NT_STATUS_V(result) == NT_STATUS_V(NT_STATUS_ACCESS_DENIED) ) {
			DEBUG(3,("winbindd_pam_auth: sam_logon returned ACCESS_DENIED.  Maybe the trust account "
				"password was changed and we didn't know it.  Killing connections to domain %s\n",
				name_domain));
			winbindd_cm_flush();
			cli->fd = -1;
		} 
		
		/* We have to try a second time as cm_get_netlogon_cli
		   might not yet have noticed that the DC has killed
		   our connection. */

	} while ( (attempts < 2) && (cli->fd == -1) );

        
	clnt_deal_with_creds(cli->sess_key, &(cli->clnt_cred), &ret_creds);
	
	if (NT_STATUS_IS_OK(result)) {
		netsamlogon_cache_store( cli->mem_ctx, &info3 );
		wcache_invalidate_samlogon(find_domain_from_name(name_domain), &info3);
	}
	
        
done:
	
	/* give us a more useful (more correct?) error code */
	if ((NT_STATUS_EQUAL(result, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND) || (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)))) {
		result = NT_STATUS_NO_LOGON_SERVERS;
	}
	
	state->response.data.auth.nt_status = NT_STATUS_V(result);
	fstrcpy(state->response.data.auth.nt_status_string, nt_errstr(result));
	fstrcpy(state->response.data.auth.error_string, get_friendly_nt_error_msg(result));
	state->response.data.auth.pam_error = nt_status_to_pam(result);

	DEBUG(NT_STATUS_IS_OK(result) ? 5 : 2, ("Plain-text authentication for user %s returned %s (PAM: %d)\n", 
	      state->request.data.auth.user, 
	      state->response.data.auth.nt_status_string,
	      state->response.data.auth.pam_error));	      

	if (mem_ctx) 
		talloc_destroy(mem_ctx);
	
	return NT_STATUS_IS_OK(result) ? WINBINDD_OK : WINBINDD_ERROR;
}

/**********************************************************************
 Challenge Response Authentication Protocol 
**********************************************************************/

enum winbindd_result winbindd_pam_auth_crap(struct winbindd_cli_state *state) 
{
	NTSTATUS result;
	unsigned char trust_passwd[16];
	time_t last_change_time;
	uint32 sec_channel_type;
        NET_USER_INFO_3 info3;
        struct cli_state *cli = NULL;
	TALLOC_CTX *mem_ctx = NULL;
	char *user = NULL;
	const char *domain = NULL;
	const char *workstation;
	DOM_CRED ret_creds;
	int attempts = 0;

	DATA_BLOB lm_resp, nt_resp;

	if (!state->privileged) {
		DEBUG(2, ("winbindd_pam_auth_crap: non-privileged access denied!\n"));
		/* send a better message than ACCESS_DENIED */
		push_utf8_fstring(state->response.data.auth.error_string, "winbind client not authorized to use winbindd_pam_auth_crap");
		result =  NT_STATUS_ACCESS_DENIED;
		goto done;
	}

	/* Ensure null termination */
	state->request.data.auth_crap.user[sizeof(state->request.data.auth_crap.user)-1]='\0';

	/* Ensure null termination */
	state->request.data.auth_crap.domain[sizeof(state->request.data.auth_crap.domain)-1]='\0';

	if (!(mem_ctx = talloc_init("winbind pam auth crap for (utf8) %s", state->request.data.auth_crap.user))) {
		DEBUG(0, ("winbindd_pam_auth_crap: could not talloc_init()!\n"));
		result = NT_STATUS_NO_MEMORY;
		goto done;
	}

        if (pull_utf8_talloc(mem_ctx, &user, state->request.data.auth_crap.user) == (size_t)-1) {
		DEBUG(0, ("winbindd_pam_auth_crap: pull_utf8_talloc failed!\n"));
	}

	if (*state->request.data.auth_crap.domain) {
		char *dom = NULL;
		if (pull_utf8_talloc(mem_ctx, &dom, state->request.data.auth_crap.domain) == (size_t)-1) {
			DEBUG(0, ("winbindd_pam_auth_crap: pull_utf8_talloc failed!\n"));
		}
		domain = dom;
	} else if (lp_winbind_use_default_domain()) {
		domain = lp_workgroup();
	} else {
		DEBUG(5,("no domain specified with username (%s) - failing auth\n", 
			 user));
		result = NT_STATUS_INVALID_PARAMETER;
		goto done;
	}

	DEBUG(3, ("[%5d]: pam auth crap domain: %s user: %s\n", state->pid,
		  domain, user));
	   
	if ( !get_trust_pw(domain, trust_passwd, &last_change_time, &sec_channel_type) ) {
		result = NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
		goto done;
	}

	if (*state->request.data.auth_crap.workstation) {
		char *wrk = NULL;
		if (pull_utf8_talloc(mem_ctx, &wrk, state->request.data.auth_crap.workstation) == (size_t)-1) {
			DEBUG(0, ("winbindd_pam_auth_crap: pull_utf8_talloc failed!\n"));
		}
		workstation = wrk;
	} else {
		workstation = global_myname();
	}

	if (state->request.data.auth_crap.lm_resp_len > sizeof(state->request.data.auth_crap.lm_resp)
		|| state->request.data.auth_crap.nt_resp_len > sizeof(state->request.data.auth_crap.nt_resp)) {
		DEBUG(0, ("winbindd_pam_auth_crap: invalid password length %u/%u\n", 
			  state->request.data.auth_crap.lm_resp_len, 
			  state->request.data.auth_crap.nt_resp_len));
		result = NT_STATUS_INVALID_PARAMETER;
		goto done;
	}

	lm_resp = data_blob_talloc(mem_ctx, state->request.data.auth_crap.lm_resp, state->request.data.auth_crap.lm_resp_len);
	nt_resp = data_blob_talloc(mem_ctx, state->request.data.auth_crap.nt_resp, state->request.data.auth_crap.nt_resp_len);
	
	do {
		ZERO_STRUCT(info3);
		ZERO_STRUCT(ret_creds);

		/* Don't shut this down - it belongs to the connection cache code */
		result = cm_get_netlogon_cli(domain, trust_passwd, sec_channel_type, False, &cli);

		if (!NT_STATUS_IS_OK(result)) {
			DEBUG(3, ("could not open handle to NETLOGON pipe (error: %s)\n",
				  nt_errstr(result)));
			goto done;
		}

		result = cli_netlogon_sam_network_logon(cli, mem_ctx,
							&ret_creds,
							user, domain,
							workstation,
							state->request.data.auth_crap.chal, 
							lm_resp, nt_resp, 
							&info3);

		attempts += 1;

		/* if we get access denied, a possible cuase was that we had and open
		   connection to the DC, but someone changed our machine accoutn password
		   out from underneath us using 'net rpc changetrustpw' */
		   
		if ( NT_STATUS_V(result) == NT_STATUS_V(NT_STATUS_ACCESS_DENIED) ) {
			DEBUG(3,("winbindd_pam_auth_crap: sam_logon returned ACCESS_DENIED.  Maybe the trust account "
				"password was changed and we didn't know it.  Killing connections to domain %s\n",
				domain));
			winbindd_cm_flush();
			cli->fd = -1;
		} 
		
		/* We have to try a second time as cm_get_netlogon_cli
		   might not yet have noticed that the DC has killed
		   our connection. */

	} while ( (attempts < 2) && (cli->fd == -1) );

	clnt_deal_with_creds(cli->sess_key, &(cli->clnt_cred), &ret_creds);
        
	if (NT_STATUS_IS_OK(result)) {
		netsamlogon_cache_store( cli->mem_ctx, &info3 );
		wcache_invalidate_samlogon(find_domain_from_name(domain), &info3);
		
		if (state->request.data.auth_crap.flags & WINBIND_PAM_INFO3_NDR) {
			result = append_info3_as_ndr(mem_ctx, state, &info3);
		}
		
		if (state->request.data.auth_crap.flags & WINBIND_PAM_NTKEY) {
			memcpy(state->response.data.auth.nt_session_key, info3.user_sess_key, sizeof(state->response.data.auth.nt_session_key) /* 16 */);
		}
		if (state->request.data.auth_crap.flags & WINBIND_PAM_LMKEY) {
			memcpy(state->response.data.auth.first_8_lm_hash, info3.padding, sizeof(state->response.data.auth.first_8_lm_hash) /* 8 */);
		}
	}

done:

	/* give us a more useful (more correct?) error code */
	if ((NT_STATUS_EQUAL(result, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND) || (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)))) {
		result = NT_STATUS_NO_LOGON_SERVERS;
	}
	
	state->response.data.auth.nt_status = NT_STATUS_V(result);
	push_utf8_fstring(state->response.data.auth.nt_status_string, nt_errstr(result));
	if (!*state->response.data.auth.error_string) 
		push_utf8_fstring(state->response.data.auth.error_string, get_friendly_nt_error_msg(result));
	state->response.data.auth.pam_error = nt_status_to_pam(result);

	DEBUG(NT_STATUS_IS_OK(result) ? 5 : 2, 
	      ("NTLM CRAP authentication for user [%s]\\[%s] returned %s (PAM: %d)\n", 
	       domain,
	       user,
	       state->response.data.auth.nt_status_string,
	       state->response.data.auth.pam_error));	      

	if (mem_ctx) 
		talloc_destroy(mem_ctx);
	
	return NT_STATUS_IS_OK(result) ? WINBINDD_OK : WINBINDD_ERROR;
}

/* Change a user password */

enum winbindd_result winbindd_pam_chauthtok(struct winbindd_cli_state *state)
{
	NTSTATUS result;
	char *oldpass, *newpass;
	fstring domain, user;
	CLI_POLICY_HND *hnd;

	DEBUG(3, ("[%5d]: pam chauthtok %s\n", state->pid,
		state->request.data.chauthtok.user));

	/* Setup crap */

	if (state == NULL)
		return WINBINDD_ERROR;

	if (!parse_domain_user(state->request.data.chauthtok.user, domain, 
			       user)) {
		result = NT_STATUS_INVALID_PARAMETER;
		goto done;
	}

	/* Change password */

	oldpass = state->request.data.chauthtok.oldpass;
	newpass = state->request.data.chauthtok.newpass;

	/* Get sam handle */

	if ( NT_STATUS_IS_ERR(result = cm_get_sam_handle(domain, &hnd)) ) {
		DEBUG(1, ("could not get SAM handle on DC for %s\n", domain));
		goto done;
	}

	if (!cli_oem_change_password(hnd->cli, user, newpass, oldpass)) {
		DEBUG(1, ("password change failed for user %s/%s\n", domain, 
			  user));
		result = NT_STATUS_WRONG_PASSWORD;
	} else {
		result = NT_STATUS_OK;
	}

done:    
	state->response.data.auth.nt_status = NT_STATUS_V(result);
	fstrcpy(state->response.data.auth.nt_status_string, nt_errstr(result));
	fstrcpy(state->response.data.auth.error_string, nt_errstr(result));
	state->response.data.auth.pam_error = nt_status_to_pam(result);

	DEBUG(NT_STATUS_IS_OK(result) ? 5 : 2, 
	      ("Password change for user [%s]\\[%s] returned %s (PAM: %d)\n", 
	       domain,
	       user,
	       state->response.data.auth.nt_status_string,
	       state->response.data.auth.pam_error));	      

	return NT_STATUS_IS_OK(result) ? WINBINDD_OK : WINBINDD_ERROR;
}