summaryrefslogtreecommitdiff
path: root/source3/smbd/uid.c
blob: 39bdaaa5960c80c91eca2fef61fe1a616ca20bb4 (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
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
/* 
   Unix SMB/Netbios implementation.
   Version 1.9.
   uid/user handling
   Copyright (C) Andrew Tridgell 1992-1998
   
   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"

/* what user is current? */
extern struct current_user current_user;

/****************************************************************************
 Become the guest user.
****************************************************************************/

BOOL become_guest(void)
{
	static struct passwd *pass=NULL;
	static uid_t guest_uid = (uid_t)-1;
	static gid_t guest_gid = (gid_t)-1;
	static fstring guest_name;

	if (!pass) {
		pass = Get_Pwnam(lp_guestaccount(-1),True);
		if (!pass)
			return(False);
		guest_uid = pass->pw_uid;
		guest_gid = pass->pw_gid;
		fstrcpy(guest_name, pass->pw_name);
	}
	
#ifdef AIX
	/* MWW: From AIX FAQ patch to WU-ftpd: call initgroups before 
	   setting IDs */
	initgroups(guest_name, guest_gid);
#endif
	
	set_sec_ctx(guest_uid, guest_gid, 0, NULL, NULL);
	
	current_user.conn = NULL;
	current_user.vuid = UID_FIELD_INVALID;
	
	return True;
}

/*******************************************************************
 Check if a username is OK.
********************************************************************/

static BOOL check_user_ok(connection_struct *conn, user_struct *vuser,int snum)
{
	int i;
	for (i=0;i<conn->uid_cache.entries;i++)
		if (conn->uid_cache.list[i] == vuser->uid)
			return(True);

	if (!user_ok(vuser->user.unix_name,snum))
		return(False);

	i = conn->uid_cache.entries % UID_CACHE_SIZE;
	conn->uid_cache.list[i] = vuser->uid;

	if (conn->uid_cache.entries < UID_CACHE_SIZE)
		conn->uid_cache.entries++;

	return(True);
}

/****************************************************************************
 Become the user of a connection number.
****************************************************************************/

BOOL become_user(connection_struct *conn, uint16 vuid)
{
	user_struct *vuser = get_valid_user_struct(vuid);
	int snum;
	gid_t gid;
	uid_t uid;
	char group_c;
	BOOL must_free_token = False;
	NT_USER_TOKEN *token = NULL;

	if (!conn) {
		DEBUG(2,("Connection not open\n"));
		return(False);
	}

	/*
	 * We need a separate check in security=share mode due to vuid
	 * always being UID_FIELD_INVALID. If we don't do this then
	 * in share mode security we are *always* changing uid's between
	 * SMB's - this hurts performance - Badly.
	 */

	if((lp_security() == SEC_SHARE) && (current_user.conn == conn) &&
	   (current_user.uid == conn->uid)) {
		DEBUG(4,("Skipping become_user - already user\n"));
		return(True);
	} else if ((current_user.conn == conn) && 
		   (vuser != 0) && (current_user.vuid == vuid) && 
		   (current_user.uid == vuser->uid)) {
		DEBUG(4,("Skipping become_user - already user\n"));
		return(True);
	}

	snum = SNUM(conn);

	if((vuser != NULL) && !check_user_ok(conn, vuser, snum))
		return False;

	if (conn->force_user || 
		conn->admin_user ||
	    (lp_security() == SEC_SHARE)) {
		uid = conn->uid;
		gid = conn->gid;
		current_user.groups = conn->groups;
		current_user.ngroups = conn->ngroups;
		token = conn->nt_user_token;
	} else {
		if (!vuser) {
			DEBUG(2,("Invalid vuid used %d\n",vuid));
			return(False);
		}
		uid = vuser->uid;
		gid = vuser->gid;
		current_user.ngroups = vuser->n_groups;
		current_user.groups  = vuser->groups;
		token = vuser->nt_user_token;
	}

	/*
	 * See if we should force group for this service.
	 * If so this overrides any group set in the force
	 * user code.
	 */

	if((group_c = *lp_force_group(snum))) {
		BOOL is_guest = False;

		if(group_c == '+') {

			/*
			 * Only force group if the user is a member of
			 * the service group. Check the group memberships for
			 * this user (we already have this) to
			 * see if we should force the group.
			 */

			int i;
			for (i = 0; i < current_user.ngroups; i++) {
				if (current_user.groups[i] == conn->gid) {
					gid = conn->gid;
					break;
				}
			}
		} else {
			gid = conn->gid;
		}

		/*
		 * We've changed the group list in the token - we must
		 * re-create it.
		 */

		if (vuser && vuser->guest)
			is_guest = True;

		token = create_nt_token(uid, gid, current_user.ngroups, current_user.groups, is_guest);
		must_free_token = True;
	}
	
	set_sec_ctx(uid, gid, current_user.ngroups, current_user.groups, token);

	/*
	 * Free the new token (as set_sec_ctx copies it).
	 */

	if (must_free_token)
		delete_nt_token(&token);

	current_user.conn = conn;
	current_user.vuid = vuid;

	DEBUG(5,("become_user uid=(%d,%d) gid=(%d,%d)\n",
		 (int)getuid(),(int)geteuid(),(int)getgid(),(int)getegid()));
  
	return(True);
}

/****************************************************************************
 Unbecome the user of a connection number.
****************************************************************************/

BOOL unbecome_user(void )
{
	set_root_sec_ctx();

	DEBUG(5,("unbecome_user now uid=(%d,%d) gid=(%d,%d)\n",
		(int)getuid(),(int)geteuid(),(int)getgid(),(int)getegid()));

	current_user.conn = NULL;
	current_user.vuid = UID_FIELD_INVALID;

	return(True);
}

/****************************************************************************
 Become the user of an authenticated connected named pipe.
 When this is called we are currently running as the connection
 user.
****************************************************************************/

BOOL become_authenticated_pipe_user(pipes_struct *p)
{
	BOOL res = push_sec_ctx();

	if (!res) {
		return False;
	}

	set_sec_ctx(p->pipe_user.uid, p->pipe_user.gid, 
		    p->pipe_user.ngroups, p->pipe_user.groups, p->pipe_user.nt_user_token);

	return True;
}

/****************************************************************************
 Unbecome the user of an authenticated connected named pipe.
 When this is called we are running as the authenticated pipe
 user and need to go back to being the connection user.
****************************************************************************/

BOOL unbecome_authenticated_pipe_user(pipes_struct *p)
{
	return pop_sec_ctx();
}

/* Temporarily become a root user.  Must match with unbecome_root(). */

void become_root(void)
{
	push_sec_ctx();
	set_root_sec_ctx();
}

/* Unbecome the root user */

void unbecome_root(void)
{
	pop_sec_ctx();
}

/*****************************************************************
 *THE CANONICAL* convert name to SID function.
 Tries winbind first - then uses local lookup.
*****************************************************************/  

BOOL lookup_name(const char *name, DOM_SID *psid, enum SID_NAME_USE *name_type)
{
	extern pstring global_myname;
	extern fstring global_myworkgroup;
	fstring sid;
	char *sep = lp_winbind_separator();

	*name_type = SID_NAME_UNKNOWN;

	if (!winbind_lookup_name(name, psid, name_type) || (*name_type != SID_NAME_USER) ) {
		BOOL ret = False;

		DEBUG(10, ("lookup_name: winbind lookup for %s failed - trying local\n", name));

		/* If we are looking up a domain user, make sure it is
		   for the local machine only */

		if (strchr_m(name, sep[0]) || strchr_m(name, '\\')) {
			fstring domain, username;

			split_domain_name(name, domain, username);

			switch (lp_server_role()) {
				case ROLE_DOMAIN_PDC:
				case ROLE_DOMAIN_BDC:
					if (strequal(domain, global_myworkgroup)) {
						fstrcpy(domain, global_myname);
						ret = local_lookup_name(domain, username, psid, name_type);
					}
					/* No break is deliberate here. JRA. */
				default:
					if (strcasecmp(global_myname, domain) != 0) {
						DEBUG(5, ("lookup_name: domain %s is not local\n", domain));
						ret = local_lookup_name(global_myname, username, psid, name_type);
					}
			}
		} else {
			ret = local_lookup_name(global_myname, name, psid, name_type);
		}

		if (ret) {
			DEBUG(10,
			      ("lookup_name: (local) %s -> SID %s (type %u)\n",
			       name, sid_to_string(sid,psid),
			       (unsigned int)*name_type ));
		} else {
			DEBUG(10,("lookup name: (local) %s failed.\n", name));
		}

		return ret;
	}

	DEBUG(10,("lookup_name (winbindd): %s -> SID %s (type %u)\n",
		  name, sid_to_string(sid, psid), 
		  (unsigned int)*name_type));
	return True;
}

/*****************************************************************
 *THE CANONICAL* convert SID to name function.
 Tries winbind first - then uses local lookup.
*****************************************************************/  

BOOL lookup_sid(DOM_SID *sid, fstring dom_name, fstring name, enum SID_NAME_USE *name_type)
{
	if (!name_type)
		return False;

	*name_type = SID_NAME_UNKNOWN;

	/* Check if this is our own sid.  This should perhaps be done by
	   winbind?  For the moment handle it here. */

	if (sid->num_auths == 5) {
		DOM_SID tmp_sid;
		uint32 rid;

		sid_copy(&tmp_sid, sid);
		sid_split_rid(&tmp_sid, &rid);

		if (sid_equal(&global_sam_sid, &tmp_sid)) {

			return map_domain_sid_to_name(&tmp_sid, dom_name) &&
				local_lookup_rid(rid, name, name_type);
		}
	}

	if (!winbind_lookup_sid(sid, dom_name, name, name_type)) {
		fstring sid_str;
		DOM_SID tmp_sid;
		uint32 rid;

		DEBUG(10,("lookup_sid: winbind lookup for SID %s failed - trying local.\n", sid_to_string(sid_str, sid) ));

		sid_copy(&tmp_sid, sid);
		sid_split_rid(&tmp_sid, &rid);
		return map_domain_sid_to_name(&tmp_sid, dom_name) &&
				lookup_known_rid(&tmp_sid, rid, name, name_type);
	}
	return True;
}

/*****************************************************************
 *THE CANONICAL* convert uid_t to SID function.
 Tries winbind first - then uses local lookup.
 Returns SID pointer.
*****************************************************************/  

DOM_SID *uid_to_sid(DOM_SID *psid, uid_t uid)
{
	fstring sid;

	if (!winbind_uid_to_sid(psid, uid)) {
		DEBUG(10,("uid_to_sid: winbind lookup for uid %u failed - trying local.\n", (unsigned int)uid ));

		return local_uid_to_sid(psid, uid);
	}

	DEBUG(10,("uid_to_sid: winbindd %u -> %s\n",
		(unsigned int)uid, sid_to_string(sid, psid) ));

	return psid;
}

/*****************************************************************
 *THE CANONICAL* convert gid_t to SID function.
 Tries winbind first - then uses local lookup.
 Returns SID pointer.
*****************************************************************/  

DOM_SID *gid_to_sid(DOM_SID *psid, gid_t gid)
{
	fstring sid;

	if (!winbind_gid_to_sid(psid, gid)) {
		DEBUG(10,("gid_to_sid: winbind lookup for gid %u failed - trying local.\n", (unsigned int)gid ));

		return local_gid_to_sid(psid, gid);
	}

	DEBUG(10,("gid_to_sid: winbindd %u -> %s\n",
		(unsigned int)gid, sid_to_string(sid,psid) ));

	return psid;
}

/*****************************************************************
 *THE CANONICAL* convert SID to uid function.
 Tries winbind first - then uses local lookup.
 Returns True if this name is a user sid and the conversion
 was done correctly, False if not. sidtype is set by this function.
*****************************************************************/  

BOOL sid_to_uid(DOM_SID *psid, uid_t *puid, enum SID_NAME_USE *sidtype)
{
	fstring dom_name, name, sid_str;
	enum SID_NAME_USE name_type;

	*sidtype = SID_NAME_UNKNOWN;

	/*
	 * First we must look up the name and decide if this is a user sid.
	 */

	if ( (!winbind_lookup_sid(psid, dom_name, name, &name_type)) || (name_type != SID_NAME_USER) ) {
		DEBUG(10,("sid_to_uid: winbind lookup for sid %s failed - trying local.\n",
				sid_to_string(sid_str, psid) ));

		return local_sid_to_uid(puid, psid, sidtype);
	}

	/*
	 * Ensure this is a user sid.
	 */

	if (name_type != SID_NAME_USER) {
		DEBUG(10,("sid_to_uid: winbind lookup succeeded but SID is not a uid (%u)\n",
				(unsigned int)name_type ));
		return False;
	}

	*sidtype = SID_NAME_USER;

	/*
	 * Get the uid for this SID.
	 */

	if (!winbind_sid_to_uid(puid, psid)) {
		DEBUG(10,("sid_to_uid: winbind lookup for sid %s failed.\n",
				sid_to_string(sid_str, psid) ));
		return False;
	}

	DEBUG(10,("sid_to_uid: winbindd %s -> %u\n",
		sid_to_string(sid_str, psid),
		(unsigned int)*puid ));

	return True;
}

/*****************************************************************
 *THE CANONICAL* convert SID to gid function.
 Tries winbind first - then uses local lookup.
 Returns True if this name is a user sid and the conversion
 was done correctly, False if not.
*****************************************************************/  

BOOL sid_to_gid(DOM_SID *psid, gid_t *pgid, enum SID_NAME_USE *sidtype)
{
	fstring dom_name, name, sid_str;
	enum SID_NAME_USE name_type;

	*sidtype = SID_NAME_UNKNOWN;

	/*
	 * First we must look up the name and decide if this is a group sid.
	 */

	if (!winbind_lookup_sid(psid, dom_name, name, &name_type)) {
		DEBUG(10,("sid_to_gid: winbind lookup for sid %s failed - trying local.\n",
				sid_to_string(sid_str, psid) ));

		return local_sid_to_gid(pgid, psid, sidtype);
	}

	/*
	 * Ensure this is a group sid.
	 */

	if ((name_type != SID_NAME_DOM_GRP) && (name_type != SID_NAME_ALIAS) && (name_type != SID_NAME_WKN_GRP)) {
		DEBUG(10,("sid_to_gid: winbind lookup succeeded but SID is not a known group (%u)\n",
				(unsigned int)name_type ));

		return local_sid_to_gid(pgid, psid, sidtype);
	}

	*sidtype = name_type;

	/*
	 * Get the gid for this SID.
	 */

	if (!winbind_sid_to_gid(pgid, psid)) {
		DEBUG(10,("sid_to_gid: winbind lookup for sid %s failed.\n",
				sid_to_string(sid_str, psid) ));
		return False;
	}

	DEBUG(10,("gid_to_uid: winbindd %s -> %u\n",
		sid_to_string(sid_str, psid),
		(unsigned int)*pgid ));

	return True;
}