summaryrefslogtreecommitdiff
path: root/source3/utils/smbpasswd.c
blob: 8ddd07a4c575cdec2e6a170258656757d3d25313 (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
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
/*
 * Unix SMB/Netbios implementation. Version 1.9. smbpasswd module. Copyright
 * (C) Jeremy Allison 1995-1998
 * 
 * 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"

extern pstring global_myname;
extern int DEBUGLEVEL;

/*
 * Next two lines needed for SunOS and don't
 * hurt anything else...
 */
extern char *optarg;
extern int optind;

/*********************************************************
a strdup with exit
**********************************************************/
static char *xstrdup(char *s)
{
	s = strdup(s);
	if (!s) {
		fprintf(stderr,"out of memory\n");
		exit(1);
	}
	return s;
}


/*********************************************************
 Print command usage on stderr and die.
**********************************************************/
static void usage(void)
{
	if (getuid() == 0) {
		printf("smbpasswd [options] [username] [password]\n");
	} else {
		printf("smbpasswd [options] [password]\n");
	}
	printf("options:\n");
	printf("  -s                   use stdin for password prompt\n");
	printf("  -D LEVEL             debug level\n");
	printf("  -U USER              remote username\n");
	printf("  -r MACHINE           remote machine\n");

	if (getuid() == 0) {
		printf("  -R ORDER             name resolve order\n");
		printf("  -j DOMAIN            join domain name\n");
		printf("  -a                   add user\n");
		printf("  -x                   delete user\n");
		printf("  -d                   disable user\n");
		printf("  -e                   enable user\n");
		printf("  -n                   set no password\n");
		printf("  -m                   machine trust account\n");
	}
	exit(1);
}

/*********************************************************
Join a domain.
**********************************************************/
static int join_domain(char *domain, char *remote)
{
	pstring remote_machine;
	fstring trust_passwd;
	unsigned char orig_trust_passwd_hash[16];
	BOOL ret;

	pstrcpy(remote_machine, remote ? remote : "");
	fstrcpy(trust_passwd, global_myname);
	strlower(trust_passwd);
	E_md4hash( (uchar *)trust_passwd, orig_trust_passwd_hash);

	/* Ensure that we are not trying to join a
	   domain if we are locally set up as a domain
	   controller. */

	if(strequal(remote, global_myname)) {
		fprintf(stderr, "Cannot join domain %s as the domain controller name is our own. We cannot be a domain controller for a domain and also be a domain member.\n", domain);
		return 1;
	}

	/*
	 * Write the old machine account password.
	 */
	
	if(!secrets_store_trust_account_password(domain,  orig_trust_passwd_hash)) {              
		fprintf(stderr, "Unable to write the machine account password for \
machine %s in domain %s.\n", global_myname, domain);
		return 1;
	}
	
	/*
	 * If we are given a remote machine assume this is the PDC.
	 */
	
	if(remote == NULL) {
		pstrcpy(remote_machine, lp_passwordserver());
	}

	if(!*remote_machine) {
		fprintf(stderr, "No password server list given in smb.conf - \
unable to join domain.\n");
		return 1;
	}

	ret = change_trust_account_password( domain, remote_machine);
	
	if(!ret) {
		trust_password_delete(domain);
		fprintf(stderr,"Unable to join domain %s.\n",domain);
	} else {
		printf("Joined domain %s.\n",domain);
	}
	
	return (int)ret;
}


static void set_line_buffering(FILE *f)
{
	setvbuf(f, NULL, _IOLBF, 0);
}

/*************************************************************
 Utility function to prompt for passwords from stdin. Each
 password entered must end with a newline.
*************************************************************/
static char *stdin_new_passwd(void)
{
	static fstring new_passwd;
	size_t len;

	ZERO_ARRAY(new_passwd);

	/*
	 * if no error is reported from fgets() and string at least contains
	 * the newline that ends the password, then replace the newline with
	 * a null terminator.
	 */
	if ( fgets(new_passwd, sizeof(new_passwd), stdin) != NULL) {
		if ((len = strlen(new_passwd)) > 0) {
			if(new_passwd[len-1] == '\n')
				new_passwd[len - 1] = 0; 
		}
	}
	return(new_passwd);
}


/*************************************************************
 Utility function to get passwords via tty or stdin
 Used if the '-s' option is set to silently get passwords
 to enable scripting.
*************************************************************/
static char *get_pass( char *prompt, BOOL stdin_get)
{
	char *p;
	if (stdin_get) {
		p = stdin_new_passwd();
	} else {
		p = getpass(prompt);
	}
	return xstrdup(p);
}

/*************************************************************
 Utility function to prompt for new password.
*************************************************************/
static char *prompt_for_new_password(BOOL stdin_get)
{
	char *p;
	fstring new_passwd;

	ZERO_ARRAY(new_passwd);
 
	p = get_pass("New SMB password:", stdin_get);

	fstrcpy(new_passwd, p);
	safe_free(p);

	p = get_pass("Retype new SMB password:", stdin_get);

	if (strcmp(p, new_passwd)) {
		fprintf(stderr, "Mismatch - password unchanged.\n");
		ZERO_ARRAY(new_passwd);
		safe_free(p);
		return NULL;
	}

	return p;
}


/*************************************************************
 Change a password either locally or remotely.
*************************************************************/

static BOOL password_change(const char *remote_machine, char *user_name, 
			    char *old_passwd, char *new_passwd, int local_flags)
{
	BOOL ret;
	pstring err_str;
	pstring msg_str;

	if (remote_machine != NULL) {
		if (local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER|LOCAL_DISABLE_USER|LOCAL_ENABLE_USER|
							LOCAL_TRUST_ACCOUNT|LOCAL_SET_NO_PASSWORD)) {
			/* these things can't be done remotely yet */
			return False;
		}
		ret = remote_password_change(remote_machine, user_name, 
									 old_passwd, new_passwd, err_str, sizeof(err_str));
		if(*err_str)
			fprintf(stderr, err_str);
		return ret;
	}
	
	ret = local_password_change(user_name, local_flags, new_passwd, 
				     err_str, sizeof(err_str), msg_str, sizeof(msg_str));

	if(*msg_str)
		printf(msg_str);
	if(*err_str)
		fprintf(stderr, err_str);

	return ret;
}


/*************************************************************
 Handle password changing for root.
*************************************************************/

static int process_root(int argc, char *argv[])
{
	struct passwd  *pwd;
	int result = 0, ch;
	BOOL joining_domain = False;
	int local_flags = 0;
	BOOL stdin_passwd_get = False;
	char *user_name = NULL;
	char *new_domain = NULL;
	char *new_passwd = NULL;
	char *old_passwd = NULL;
	char *remote_machine = NULL;

	while ((ch = getopt(argc, argv, "ax:d:e:mnj:r:sR:D:U:")) != EOF) {
		switch(ch) {
		case 'a':
			local_flags |= LOCAL_ADD_USER;
			break;
		case 'x':
			local_flags |= LOCAL_DELETE_USER;
			user_name = optarg;
			new_passwd = xstrdup("XXXXXX");
			break;
		case 'd':
			local_flags |= LOCAL_DISABLE_USER;
			user_name = optarg;
			new_passwd = xstrdup("XXXXXX");
			break;
		case 'e':
			local_flags |= LOCAL_ENABLE_USER;
			user_name = optarg;
			break;
		case 'm':
			local_flags |= LOCAL_TRUST_ACCOUNT;
			break;
		case 'n':
			local_flags |= LOCAL_SET_NO_PASSWORD;
			new_passwd = xstrdup("NO PASSWORD");
			break;
		case 'j':
			new_domain = optarg;
			strupper(new_domain);
			joining_domain = True;
			break;
		case 'r':
			remote_machine = optarg;
			break;
		case 's':
			set_line_buffering(stdin);
			set_line_buffering(stdout);
			set_line_buffering(stderr);
			stdin_passwd_get = True;
			break;
		case 'R':
			lp_set_name_resolve_order(optarg);
			break;
		case 'D':
			DEBUGLEVEL = atoi(optarg);
			break;
		case 'U':
			user_name = optarg;
			break;
		default:
			usage();
		}
	}
	
	argc -= optind;
	argv += optind;

	/*
	 * Ensure both add/delete user are not set
	 * Ensure add/delete user and either remote machine or join domain are
	 * not both set.
	 */	
	if(((local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER)) == (LOCAL_ADD_USER|LOCAL_DELETE_USER)) || 
	   ((local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER)) && 
		((remote_machine != NULL) || joining_domain))) {
		usage();
	}
	
	/* Only load interfaces if we are doing network operations. */

	if (joining_domain || remote_machine) {
		load_interfaces();
	}

	if(joining_domain) {
		if (argc != 0)
			usage();
		return join_domain(new_domain, remote_machine);
	}

	/*
	 * Deal with root - can add a user, but only locally.
	 */

	switch(argc) {
	case 0:
		break;
	case 1:
		user_name = argv[0];
		break;
	case 2:
		user_name = argv[0];
		new_passwd = xstrdup(argv[1]);
		break;
	default:
		usage();
	}

	if (!user_name && (pwd = sys_getpwuid(0))) {
		user_name = xstrdup(pwd->pw_name);
	} 

	if (!user_name) {
		fprintf(stderr,"You must specify a username\n");
		exit(1);
	}

	if (local_flags & LOCAL_TRUST_ACCOUNT) {
		/* add the $ automatically */
		static fstring buf;

		/*
		 * Remove any trailing '$' before we
		 * generate the initial machine password.
		 */

		if (user_name[strlen(user_name)-1] == '$') {
			user_name[strlen(user_name)-1] = 0;
		}

		if (local_flags & LOCAL_ADD_USER) {
		        safe_free(new_passwd);
			new_passwd = xstrdup(user_name);
			strlower(new_passwd);
		}

		/*
		 * Now ensure the username ends in '$' for
		 * the machine add.
		 */

		slprintf(buf, sizeof(buf)-1, "%s$", user_name);
		user_name = buf;
	}

	if (remote_machine != NULL) {
		old_passwd = get_pass("Old SMB password:",stdin_passwd_get);
	}
	
	if (!new_passwd) {

		/*
		 * If we are trying to enable a user, first we need to find out
		 * if they are using a modern version of the smbpasswd file that
		 * disables a user by just writing a flag into the file. If so
		 * then we can re-enable a user without prompting for a new
		 * password. If not (ie. they have a no stored password in the
		 * smbpasswd file) then we need to prompt for a new password.
		 */

		if(local_flags & LOCAL_ENABLE_USER) {
			SAM_ACCOUNT *sampass = pdb_getsampwnam(user_name);
			if((sampass != NULL) && (pdb_get_lanman_passwd(sampass) != NULL)) {
				new_passwd = xstrdup("XXXX"); /* Don't care. */
			}
		}

		if(!new_passwd)
			new_passwd = prompt_for_new_password(stdin_passwd_get);

		if(!new_passwd) {
			fprintf(stderr, "Unable to get new password.\n");
			exit(1);
		}
	}
	
	if (!password_change(remote_machine, user_name, old_passwd, new_passwd, local_flags)) {
		fprintf(stderr,"Failed to modify password entry for user %s\n", user_name);
		result = 1;
		goto done;
	} 

	if(!(local_flags & (LOCAL_ADD_USER|LOCAL_DISABLE_USER|LOCAL_ENABLE_USER|LOCAL_DELETE_USER|LOCAL_SET_NO_PASSWORD))) {
		SAM_ACCOUNT *sampass = pdb_getsampwnam(user_name);
		printf("Password changed for user %s.", user_name );
		if( (sampass != NULL) && (pdb_get_acct_ctrl(sampass)&ACB_DISABLED) )
			printf(" User has disabled flag set.");
		if((sampass != NULL) && (pdb_get_acct_ctrl(sampass) & ACB_PWNOTREQ) )
			printf(" User has no password flag set.");
		printf("\n");
	}

 done:
	safe_free(new_passwd);
	return result;
}


/*************************************************************
handle password changing for non-root
*************************************************************/
static int process_nonroot(int argc, char *argv[])
{
	struct passwd  *pwd = NULL;
	int result = 0, ch;
	BOOL stdin_passwd_get = False;
	char *old_passwd = NULL;
	char *remote_machine = NULL;
	char *user_name = NULL;
	char *new_passwd = NULL;

	while ((ch = getopt(argc, argv, "hD:r:sU:")) != EOF) {
		switch(ch) {
		case 'D':
			DEBUGLEVEL = atoi(optarg);
			break;
		case 'r':
			remote_machine = optarg;
			break;
		case 's':
			set_line_buffering(stdin);
			set_line_buffering(stdout);
			set_line_buffering(stderr);
			stdin_passwd_get = True;
			break;
		case 'U':
			user_name = optarg;
			break;
		default:
			usage();
		}
	}
	
	argc -= optind;
	argv += optind;

	if(argc > 1) {
		usage();
	}
	
	if (argc == 1) {
		new_passwd = argv[0];
	}
	
	if (!user_name) {
		pwd = sys_getpwuid(getuid());
		if (pwd) {
			user_name = xstrdup(pwd->pw_name);
		} else {
			fprintf(stderr,"you don't exist - go away\n");
			exit(1);
		}
	}
	
	/*
	 * A non-root user is always setting a password
	 * via a remote machine (even if that machine is
	 * localhost).
	 */	

	load_interfaces(); /* Delayed from main() */

	if (remote_machine == NULL) {
		remote_machine = "127.0.0.1";
	}

	if (remote_machine != NULL) {
		old_passwd = get_pass("Old SMB password:",stdin_passwd_get);
	}
	
	if (!new_passwd) {
		new_passwd = prompt_for_new_password(stdin_passwd_get);
	}
	
	if (!new_passwd) {
		fprintf(stderr, "Unable to get new password.\n");
		exit(1);
	}

	if (!password_change(remote_machine, user_name, old_passwd, new_passwd, 0)) {
		fprintf(stderr,"Failed to change password for %s\n", user_name);
		result = 1;
		goto done;
	}

	printf("Password changed for user %s\n", user_name);

 done:
	safe_free(old_passwd);
	safe_free(new_passwd);

	return result;
}



/*********************************************************
 Start here.
**********************************************************/
int main(int argc, char **argv)
{	
	static pstring servicesf = CONFIGFILE;

#if defined(HAVE_SET_AUTH_PARAMETERS)
	set_auth_parameters(argc, argv);
#endif /* HAVE_SET_AUTH_PARAMETERS */

	TimeInit();
	
	setup_logging("smbpasswd", True);
	
	charset_initialise();
	
	if(!initialize_password_db(True)) {
		fprintf(stderr, "Can't setup password database vectors.\n");
		exit(1);
	}

	if (!lp_load(servicesf,True,False,False)) {
		fprintf(stderr, "Can't load %s - run testparm to debug it\n", 
			servicesf);
		exit(1);
	}

	/*
	 * Set the machine NETBIOS name if not already
	 * set from the config file. 
	 */ 
    
	if (!*global_myname) {   
		char *p;
		fstrcpy(global_myname, myhostname());
		p = strchr(global_myname, '.' );
		if (p) *p = 0;
	}           
	strupper(global_myname);

	codepage_initialise(lp_client_code_page());

	secrets_init();

	/* Check the effective uid - make sure we are not setuid */
	if ((geteuid() == (uid_t)0) && (getuid() != (uid_t)0)) {
		fprintf(stderr, "smbpasswd must *NOT* be setuid root.\n");
		exit(1);
	}

	if (getuid() == 0) {
		return process_root(argc, argv);
	} 

	return process_nonroot(argc, argv);
}