summaryrefslogtreecommitdiff
path: root/source3/nsswitch/winbindd_util.c
blob: f90e89c23f4b44733dcd16fa39ca55d4bb4e5171 (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
/* 
   Unix SMB/Netbios implementation.

   Winbind daemon for ntdom nss module

   Copyright (C) Tim Potter 2000-2001
   Copyright (C) 2001 by Martin Pool <mbp@samba.org>
   
   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"
#include "sids.h"

/**
 * @file winbindd_util.c
 *
 * Winbind daemon for NT domain authentication nss module.
 **/


/**
 * Used to clobber name fields that have an undefined value.
 *
 * Correct code should never look at a field that has this value.
 **/

static const fstring name_deadbeef = "<deadbeef>";

/* The list of trusted domains.  Note that the list can be deleted and
   recreated using the init_domain_list() function so pointers to
   individual winbindd_domain structures cannot be made.  Keep a copy of
   the domain name instead. */

static struct winbindd_domain *_domain_list;

struct winbindd_domain *domain_list(void)
{
	/* Initialise list */

	if (!_domain_list)
		init_domain_list();

	return _domain_list;
}

/* Free all entries in the trusted domain list */

void free_domain_list(void)
{
	struct winbindd_domain *domain = _domain_list;

	while(domain) {
		struct winbindd_domain *next = domain->next;
		
		DLIST_REMOVE(_domain_list, domain);
		SAFE_FREE(domain);
		domain = next;
	}
}

/* Add a trusted domain to our list of domains */

static struct winbindd_domain *add_trusted_domain(char *domain_name,
						  struct winbindd_methods *methods)
{
	struct winbindd_domain *domain;
        
	/* We can't call domain_list() as this function is called from
	   init_domain_list() and we'll get stuck in a loop. */

	for (domain = _domain_list; domain; domain = domain->next) {
		if (strcmp(domain_name, domain->name) == 0) {
			DEBUG(3, ("domain %s already in domain list\n", 
				  domain_name));
			return domain;
		}
	}
        
	/* Create new domain entry */

	if ((domain = (struct winbindd_domain *)
	     malloc(sizeof(*domain))) == NULL)
		return NULL;

	/* Fill in fields */
        
	ZERO_STRUCTP(domain);

	fstrcpy(domain->name, domain_name);
        domain->methods = methods;
	domain->sequence_number = DOM_SEQUENCE_NONE;
	domain->last_seq_check = 0;

	/* Link to domain list */
        
	DLIST_ADD(_domain_list, domain);
        
	return domain;
}

/* Look up global info for the winbind daemon */

BOOL init_domain_list(void)
{
	NTSTATUS result;
	TALLOC_CTX *mem_ctx;
	extern struct winbindd_methods cache_methods;
	struct winbindd_domain *domain;
	DOM_SID *dom_sids;
	char **names;
	int num_domains = 0;

	if (!(mem_ctx = talloc_init_named("init_domain_list")))
		return False;

	/* Free existing list */

	free_domain_list();

	/* Add ourselves as the first entry */

	domain = add_trusted_domain(lp_workgroup(), &cache_methods);

	/* Now we *must* get the domain sid for our primary domain. Go into
	   a holding pattern until that is available */

	result = cache_methods.domain_sid(domain, &domain->sid);
	while (!NT_STATUS_IS_OK(result)) {
		sleep(10);
		DEBUG(1,("Retrying startup domain sid fetch for %s\n",
			 domain->name));
		result = cache_methods.domain_sid(domain, &domain->sid);
	}
       
	DEBUG(1,("Added domain %s (%s)\n", 
		 domain->name, 
		 sid_string_static(&domain->sid)));

	DEBUG(1, ("getting trusted domain list\n"));

	result = cache_methods.trusted_domains(domain, mem_ctx, &num_domains,
					       &names, &dom_sids);

	/* Add each domain to the trusted domain list */
	if (NT_STATUS_IS_OK(result)) {
		int i;
		for(i = 0; i < num_domains; i++) {
			domain = add_trusted_domain(names[i], &cache_methods);
			if (domain) {
				sid_copy(&domain->sid, &dom_sids[i]);
			}
			DEBUG(1,("Added domain %s (%s)\n", 
				 domain->name, 
				 sid_string_static(&domain->sid)));

			/* this primes the connection */
			cache_methods.domain_sid(domain, &domain->sid);
		}
	}

	talloc_destroy(mem_ctx);
	return True;
}

/* Given a domain name, return the struct winbindd domain info for it 
   if it is actually working. */

struct winbindd_domain *find_domain_from_name(char *domain_name)
{
	struct winbindd_domain *domain;

	/* Search through list */

	for (domain = domain_list(); domain != NULL; domain = domain->next) {
		if (strequal(domain_name, domain->name) ||
		    strequal(domain_name, domain->full_name))
			return domain;
	}

	/* Not found */

	return NULL;
}

/* Given a domain sid, return the struct winbindd domain info for it */

struct winbindd_domain *find_domain_from_sid(DOM_SID *sid)
{
	struct winbindd_domain *domain;

	/* Search through list */

	for (domain = domain_list(); domain != NULL; domain = domain->next) {
		if (sid_compare_domain(sid, &domain->sid) == 0)
			return domain;
	}

	/* Not found */

	return NULL;
}

/* Lookup a sid in a domain from a name */

BOOL winbindd_lookup_sid_by_name(struct winbindd_domain *domain, 
				 const char *name, DOM_SID *sid, 
				 enum SID_NAME_USE *type)
{
	NTSTATUS result;
        
	/* Don't bother with machine accounts */
        
	if (name[strlen(name) - 1] == '$')
		return False;

	/* Lookup name */
	result = domain->methods->name_to_sid(domain, name, sid, type);
        
	/* Return rid and type if lookup successful */
	if (!NT_STATUS_IS_OK(result)) {
		*type = SID_NAME_UNKNOWN;
	}

	return NT_STATUS_IS_OK(result);
}

/**
 * @brief Lookup a name in a domain from a sid.
 *
 * @param sid Security ID you want to look up.
 *
 * @param name On success, set to the name corresponding to @p sid.
 * 
 * @param type On success, contains the type of name: alias, group or
 * user.
 *
 * @retval True if the name exists, in which case @p name and @p type
 * are set, otherwise False.
 **/
BOOL winbindd_lookup_name_by_sid(DOM_SID *sid,
				 fstring name,
				 enum SID_NAME_USE *type)
{
	char *names;
	NTSTATUS result;
	TALLOC_CTX *mem_ctx;
	BOOL rv = False;
	struct winbindd_domain *domain;

	domain = find_domain_from_sid(sid);

	if (!domain) {
		DEBUG(1,("Can't find domain from sid\n"));
		return False;
	}

	/* Lookup name */

	if (!(mem_ctx = talloc_init_named("winbindd_lookup_name_by_sid")))
		return False;
        
	result = domain->methods->sid_to_name(domain, mem_ctx, sid, &names, type);

	/* Return name and type if successful */
        
	if ((rv = NT_STATUS_IS_OK(result))) {
		fstrcpy(name, names);
	} else {
		*type = SID_NAME_UNKNOWN;
		fstrcpy(name, name_deadbeef);
	}
        
	talloc_destroy(mem_ctx);

	return rv;
}


/* Free state information held for {set,get,end}{pw,gr}ent() functions */

void free_getent_state(struct getent_state *state)
{
	struct getent_state *temp;

	/* Iterate over state list */

	temp = state;

	while(temp != NULL) {
		struct getent_state *next;

		/* Free sam entries then list entry */

		SAFE_FREE(state->sam_entries);
		DLIST_REMOVE(state, state);
		next = temp->next;

		SAFE_FREE(temp);
		temp = next;
	}
}

/* Initialise trusted domain info */

BOOL winbindd_param_init(void)
{
	/* Parse winbind uid and winbind_gid parameters */

	if (!lp_winbind_uid(&server_state.uid_low, &server_state.uid_high)) {
		DEBUG(0, ("winbind uid range missing or invalid\n"));
		return False;
	}
	
	if (!lp_winbind_gid(&server_state.gid_low, &server_state.gid_high)) {
		DEBUG(0, ("winbind gid range missing or invalid\n"));
		return False;
	}
	
	return True;
}

/* Check if a domain is present in a comma-separated list of domains */

BOOL check_domain_env(char *domain_env, char *domain)
{
	fstring name;
	char *tmp = domain_env;

	while(next_token(&tmp, name, ",", sizeof(fstring))) {
		if (strequal(name, domain))
			return True;
	}

	return False;
}

/* Parse a string of the form DOMAIN/user into a domain and a user */

BOOL parse_domain_user(const char *domuser, fstring domain, fstring user)
{
	char *p = strchr(domuser,*lp_winbind_separator());

	if (!p)
		return False;
	
	fstrcpy(user, p+1);
	fstrcpy(domain, domuser);
	domain[PTR_DIFF(p, domuser)] = 0;
	strupper(domain);
	return True;
}