summaryrefslogtreecommitdiff
path: root/source3/lib/username.c
blob: 24195b196bb750b0f9b9c44942f6f78c729fdc1c (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
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
/* 
   Unix SMB/Netbios implementation.
   Version 1.9.
   Username 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"

/* internal functions */
static struct passwd *uname_string_combinations(char *s, struct passwd * (*fn) (char *), int N);
static struct passwd *uname_string_combinations2(char *s, int offset, struct passwd * (*fn) (char *), int N);

/****************************************************************************
 Get a users home directory.
****************************************************************************/

char *get_user_home_dir(char *user)
{
  static struct passwd *pass;

  pass = Get_Pwnam(user, False);

  if (!pass) return(NULL);
  return(pass->pw_dir);      
}


/*******************************************************************
 Map a username from a dos name to a unix name by looking in the username
 map. Note that this modifies the name in place.
 This is the main function that should be called *once* on
 any incoming or new username - in order to canonicalize the name.
 This is being done to de-couple the case conversions from the user mapping
 function. Previously, the map_username was being called
 every time Get_Pwnam was called.
 Returns True if username was changed, false otherwise.
********************************************************************/

BOOL map_username(char *user)
{
  static BOOL initialised=False;
  static fstring last_from,last_to;
  XFILE *f;
  char *mapfile = lp_username_map();
  char *s;
  pstring buf;
  BOOL mapped_user = False;

  if (!*user)
    return False;

  if (!*mapfile)
    return False;

  if (!initialised) {
    *last_from = *last_to = 0;
    initialised = True;
  }

  if (strequal(user,last_to))
    return False;

  if (strequal(user,last_from)) {
    DEBUG(3,("Mapped user %s to %s\n",user,last_to));
    fstrcpy(user,last_to);
    return True;
  }
  
  f = x_fopen(mapfile,O_RDONLY, 0);
  if (!f) {
    DEBUG(0,("can't open username map %s. Error %s\n",mapfile, strerror(errno) ));
    return False;
  }

  DEBUG(4,("Scanning username map %s\n",mapfile));

  while((s=fgets_slash(buf,sizeof(buf),f))!=NULL) {
    char *unixname = s;
    char *dosname = strchr_m(unixname,'=');
    char **dosuserlist;
    BOOL return_if_mapped = False;

    if (!dosname)
      continue;

    *dosname++ = 0;

    while (isspace(*unixname))
      unixname++;
    if ('!' == *unixname) {
      return_if_mapped = True;
      unixname++;
      while (*unixname && isspace(*unixname))
        unixname++;
    }
    
    if (!*unixname || strchr_m("#;",*unixname))
      continue;

    {
      int l = strlen(unixname);
      while (l && isspace(unixname[l-1])) {
        unixname[l-1] = 0;
        l--;
      }
    }

    dosuserlist = lp_list_make(dosname);
    if (!dosuserlist) {
    	DEBUG(0,("Unable to build user list\n"));
	return False;
    }

    if (strchr_m(dosname,'*') || user_in_list(user, dosuserlist)) {
      DEBUG(3,("Mapped user %s to %s\n",user,unixname));
      mapped_user = True;
      fstrcpy(last_from,user);
      sscanf(unixname,"%s",user);
      fstrcpy(last_to,user);
      if(return_if_mapped) {
      	lp_list_free (&dosuserlist);
        x_fclose(f);
        return True;
      }
    }
    
    lp_list_free (&dosuserlist);
  }

  x_fclose(f);

  /*
   * Setup the last_from and last_to as an optimization so 
   * that we don't scan the file again for the same user.
   */
  fstrcpy(last_from,user);
  fstrcpy(last_to,user);

  return mapped_user;
}

/****************************************************************************
 Get_Pwnam wrapper
****************************************************************************/

static struct passwd *_Get_Pwnam(char *s)
{
  struct passwd *ret;

  ret = sys_getpwnam(s);
  if (ret) {
#ifdef HAVE_GETPWANAM
    struct passwd_adjunct *pwret;
    pwret = getpwanam(s);
    if (pwret && pwret->pwa_passwd) {
      pstrcpy(ret->pw_passwd,pwret->pwa_passwd);
    }
#endif
  }

  return(ret);
}


/*
 * A wrapper for getpwnam().  The following variations are tried:
 *   - as transmitted
 *   - in all lower case if this differs from transmitted
 *   - in all upper case if this differs from transmitted
 *   - using lp_usernamelevel() for permutations.
 * NOTE: This can potentially modify 'user' depending on value of
 *       allow_change!
 */
struct passwd *Get_Pwnam(char *user,BOOL allow_change)
{
	fstring user2;
	struct passwd *ret = NULL;

	if (!user || !(*user))
		return(NULL);

	fstrcpy(user2, user);

	/* Try in all lower case first as this is the most 
	   common case on UNIX systems */
	strlower(user2);
	DEBUG(5,("Trying _Get_Pwnam(), username as lowercase is %s\n",user2));
	ret = _Get_Pwnam(user2);
	if(ret)
		goto done;

	/* Try as given, if username wasn't originally lowercase */
	if(strcmp(user,user2) != 0) {
		DEBUG(5,("Trying _Get_Pwnam(), username as given is %s\n",user));
		ret = _Get_Pwnam(user);
		if(ret)
			goto done;
	}	

	/* Try as uppercase, if username wasn't originally uppercase */
	strupper(user2);
	if(strcmp(user,user2) != 0) {
		DEBUG(5,("Trying _Get_Pwnam(), username as uppercase is %s\n",user2));
		ret = _Get_Pwnam(user2);
		if(ret)
			goto done;
	}

	/* Try all combinations up to usernamelevel */
	strlower(user2);
	DEBUG(5,("Checking combinations of %d uppercase letters in %s\n",lp_usernamelevel(),user2));
	ret = uname_string_combinations(user2, _Get_Pwnam, lp_usernamelevel());

done:
	DEBUG(5,("Get_Pwnam %s find a valid username!\n",ret ? "did":"didn't"));
	/* If caller wants the modified username, ensure they get it  */
	if(allow_change)
		fstrcpy(user,user2);

	/* We can safely assume ret is NULL if none of the above succeed */
	return(ret);  
}

/****************************************************************************
 Check if a user is in a netgroup user list.
****************************************************************************/

static BOOL user_in_netgroup_list(char *user,char *ngname)
{
#ifdef HAVE_NETGROUP
  static char *mydomain = NULL;
  if (mydomain == NULL)
    yp_get_default_domain(&mydomain);

  if(mydomain == NULL) {
    DEBUG(5,("Unable to get default yp domain\n"));
  } else {
    DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
          user, mydomain, ngname));
    DEBUG(5,("innetgr is %s\n",
          innetgr(ngname, NULL, user, mydomain)
          ? "TRUE" : "FALSE"));

    if (innetgr(ngname, NULL, user, mydomain))
      return (True);
  }
#endif /* HAVE_NETGROUP */
  return False;
}

/****************************************************************************
 Check if a user is in a winbind group.
****************************************************************************/
  
static BOOL user_in_winbind_group_list(char *user,char *gname, BOOL *winbind_answered)
{
	int num_groups;
	int i;
 	gid_t *groups = NULL;
 	gid_t gid;
 	BOOL ret = False;
 
 	*winbind_answered = False;
 
 	/*
 	 * Get the gid's that this user belongs to.
 	 */
 
 	if ((num_groups = winbind_getgroups(user, 0, NULL)) == -1)
 		return False;
 
 	if (num_groups == 0) {
 		*winbind_answered = True;
 		return False;
 	}
 
 	if ((groups = (gid_t *)malloc(sizeof(gid_t) * num_groups )) == NULL) {
 		DEBUG(0,("user_in_winbind_group_list: malloc fail.\n"));
 		goto err;
 	}
 
 	if ((num_groups = winbind_getgroups(user, num_groups, groups)) == -1) {
 		DEBUG(0,("user_in_winbind_group_list: second winbind_getgroups call \
failed with error %s\n", strerror(errno) ));
 		goto err;
	}
 
 	/*
 	 * Now we have the gid list for this user - convert the gname
 	 * to a gid_t via either winbind or the local UNIX lookup and do the comparison.
 	 */
 
	if ((gid = nametogid(gname)) == (gid_t)-1) {
 		DEBUG(0,("user_in_winbind_group_list: winbind_lookup_name for group %s failed.\n",
 			gname ));
 		goto err;
 	}
 
 	for (i = 0; i < num_groups; i++) {
 		if (gid == groups[i]) {
 			ret = True;
 			break;
 		}
 	}
 
 	*winbind_answered = True;
 	SAFE_FREE(groups);
 	return ret;
 
   err:
 
 	*winbind_answered = False;
 	SAFE_FREE(groups);
 	return False;
}	      
 
/****************************************************************************
 Check if a user is in a UNIX group.
****************************************************************************/

static BOOL user_in_unix_group_list(char *user,char *gname)
{
	struct group *gptr;
	char **member;  
	struct passwd *pass = Get_Pwnam(user,False);

	DEBUG(10,("user_in_unix_group_list: checking user %s in group %s\n", user, gname));

 	/*
 	 * We need to check the users primary group as this
 	 * group is implicit and often not listed in the group database.
 	 */
 
 	if (pass) {
 		gptr = getgrgid(pass->pw_gid);
 		if (gptr && strequal(gptr->gr_name,gname)) {
 			DEBUG(10,("user_in_unix_group_list: group %s is primary group.\n", gname ));
 			return True;
 		}
 	}
 
 	if ((gptr = (struct group *)getgrnam(gname)) == NULL) {
 		DEBUG(10,("user_in_unix_group_list: no such group %s\n", gname ));
 		return False;
 	}
 
 	member = gptr->gr_mem;
  	while (member && *member) {
 		DEBUG(10,("user_in_unix_group_list: checking user %s against member %s\n", user, *member ));
  		if (strequal(*member,user)) {
  			return(True);
  		}
		member++;
	}

	return False;
}	      

/****************************************************************************
 Check if a user is in a group list. Ask winbind first, then use UNIX.
****************************************************************************/

BOOL user_in_group_list(char *user,char *gname)
{
	BOOL winbind_answered = False;
	BOOL ret = user_in_winbind_group_list(user, gname, &winbind_answered);

	if (winbind_answered)
		return ret;

	return user_in_unix_group_list(user, gname);	
}

/****************************************************************************
 Check if a user is in a user list - can check combinations of UNIX
 and netgroup lists.
****************************************************************************/

BOOL user_in_list(char *user,char **list)
{

  if (!list || !*list) return False;

  DEBUG(10,("user_in_list: checking user %s in list\n", user));

  while (*list) {
    /*
     * Check raw username.
     */
    if (strequal(user, *list))
      return(True);

    /*
     * Now check to see if any combination
     * of UNIX and netgroups has been specified.
     */

    if(**list == '@') {
      /*
       * Old behaviour. Check netgroup list
       * followed by UNIX list.
       */
      if(user_in_netgroup_list(user, *list +1))
        return True;
      if(user_in_group_list(user, *list +1))
        return True;
    } else if (**list == '+') {

      if((*(*list +1)) == '&') {
        /*
         * Search UNIX list followed by netgroup.
         */
        if(user_in_group_list(user, *list +2))
          return True;
        if(user_in_netgroup_list(user, *list +2))
          return True;

      } else {

        /*
         * Just search UNIX list.
         */

        if(user_in_group_list(user, *list +1))
          return True;
      }

    } else if (**list == '&') {

      if(*(*list +1) == '+') {
        /*
         * Search netgroup list followed by UNIX list.
         */
        if(user_in_netgroup_list(user, *list +2))
          return True;
        if(user_in_group_list(user, *list +2))
          return True;
      } else {
        /*
         * Just search netgroup list.
         */
        if(user_in_netgroup_list(user, *list +1))
          return True;
      }
    }
    
    list++;
  }
  return(False);
}

/* The functions below have been taken from password.c and slightly modified */
/****************************************************************************
 Apply a function to upper/lower case combinations
 of a string and return true if one of them returns true.
 Try all combinations with N uppercase letters.
 offset is the first char to try and change (start with 0)
 it assumes the string starts lowercased
****************************************************************************/

static struct passwd *uname_string_combinations2(char *s,int offset,struct passwd *(*fn)(char *),int N)
{
  ssize_t len = (ssize_t)strlen(s);
  int i;
  struct passwd *ret;

#ifdef PASSWORD_LENGTH
  len = MIN(len,PASSWORD_LENGTH);
#endif

  if (N <= 0 || offset >= len)
    return(fn(s));

  for (i=offset;i<(len-(N-1));i++) {
    char c = s[i];
    if (!islower(c))
      continue;
    s[i] = toupper(c);
    ret = uname_string_combinations2(s,i+1,fn,N-1);
    if(ret)
      return(ret);
    s[i] = c;
  }
  return(NULL);
}

/****************************************************************************
 Apply a function to upper/lower case combinations
 of a string and return true if one of them returns true.
 Try all combinations with up to N uppercase letters.
 offset is the first char to try and change (start with 0)
 it assumes the string starts lowercased
****************************************************************************/

static struct passwd * uname_string_combinations(char *s,struct passwd * (*fn)(char *),int N)
{
  int n;
  struct passwd *ret;

  for (n=1;n<=N;n++) {
    ret = uname_string_combinations2(s,0,fn,n);
    if(ret)
      return(ret);
  }
  return(NULL);
}


/****************************************************************************
these wrappers allow appliance mode to work. In appliance mode the username
takes the form DOMAIN/user
****************************************************************************/
struct passwd *smb_getpwnam(char *user, BOOL allow_change)
{
	struct passwd *pw;
	char *p;
	char *sep;
	extern pstring global_myname;

	pw = Get_Pwnam(user, allow_change);
	if (pw) return pw;

	/* if it is a domain qualified name and it isn't in our password
	   database but the domain portion matches our local machine name then
	   lookup just the username portion locally */
	sep = lp_winbind_separator();
	if (!sep || !*sep) sep = "\\";
	p = strchr_m(user,*sep);
	if (p && 
	    strncasecmp(global_myname, user, strlen(global_myname))==0) {
		return Get_Pwnam(p+1, allow_change);
	}

	return NULL;
}