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s3:utils: Make strings const passed to password_change() in smbpasswd
[Samba.git] / source3 / utils / smbpasswd.c
blob5c75f48189d434bcfe57796f8a6f9fa3775100f0
1 /*
2 * Unix SMB/CIFS implementation.
3 * Copyright (C) Jeremy Allison 1995-1998
4 * Copyright (C) Tim Potter 2001
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 3 of the License, or (at your
9 * option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * more details.
15 *
16 * You should have received a copy of the GNU General Public License along with
17 * this program; if not, see <http://www.gnu.org/licenses/>. */
18
19 #include "includes.h"
20 #include "system/passwd.h"
21 #include "secrets.h"
22 #include "../librpc/gen_ndr/samr.h"
23 #include "../lib/util/util_pw.h"
24 #include "libsmb/proto.h"
25 #include "passdb.h"
26
27 /*
28 * Next two lines needed for SunOS and don't
29 * hurt anything else...
30 */
31 extern char *optarg;
32 extern int optind;
33
34 /* forced running in root-mode */
35 static bool got_username = False;
36 static bool stdin_passwd_get = False;
37 static fstring user_name;
38 static char *new_passwd = NULL;
39 static const char *remote_machine = NULL;
40
41 static fstring ldap_secret;
42
43
44 /*********************************************************
45 Print command usage on stderr and die.
46 **********************************************************/
47 static void usage(void)
48 {
49 printf("When run by root:\n");
50 printf(" smbpasswd [options] [username]\n");
51 printf("otherwise:\n");
52 printf(" smbpasswd [options]\n\n");
53
54 printf("options:\n");
55 printf(" -L local mode (must be first option)\n");
56 printf(" -h print this usage message\n");
57 printf(" -s use stdin for password prompt\n");
58 printf(" -c smb.conf file Use the given path to the smb.conf file\n");
59 printf(" -D LEVEL debug level\n");
60 printf(" -r MACHINE remote machine\n");
61 printf(" -U USER remote username\n");
62
63 printf("extra options when run by root or in local mode:\n");
64 printf(" -a add user\n");
65 printf(" -d disable user\n");
66 printf(" -e enable user\n");
67 printf(" -i interdomain trust account\n");
68 printf(" -m machine trust account\n");
69 printf(" -n set no password\n");
70 printf(" -W use stdin ldap admin password\n");
71 printf(" -w PASSWORD ldap admin password\n");
72 printf(" -x delete user\n");
73 printf(" -R ORDER name resolve order\n");
74
75 exit(1);
76 }
77
78 static void set_line_buffering(FILE *f)
79 {
80 setvbuf(f, NULL, _IOLBF, 0);
81 }
82
83 /*******************************************************************
84 Process command line options
85 ******************************************************************/
86
87 static int process_options(int argc, char **argv, int local_flags)
88 {
89 int ch;
90 const char *configfile = get_dyn_CONFIGFILE();
91
92 local_flags |= LOCAL_SET_PASSWORD;
93
94 ZERO_STRUCT(user_name);
95
96 user_name[0] = '\0';
97
98 while ((ch = getopt(argc, argv, "c:axdehminjr:sw:R:D:U:LW")) != EOF) {
99 switch(ch) {
100 case 'L':
101 if (getuid() != 0) {
102 fprintf(stderr, "smbpasswd -L can only be used by root.\n");
103 exit(1);
104 }
105 local_flags |= LOCAL_AM_ROOT;
106 break;
107 case 'c':
108 configfile = optarg;
109 set_dyn_CONFIGFILE(optarg);
110 break;
111 case 'a':
112 local_flags |= LOCAL_ADD_USER;
113 break;
114 case 'x':
115 local_flags |= LOCAL_DELETE_USER;
116 local_flags &= ~LOCAL_SET_PASSWORD;
117 break;
118 case 'd':
119 local_flags |= LOCAL_DISABLE_USER;
120 local_flags &= ~LOCAL_SET_PASSWORD;
121 break;
122 case 'e':
123 local_flags |= LOCAL_ENABLE_USER;
124 local_flags &= ~LOCAL_SET_PASSWORD;
125 break;
126 case 'm':
127 local_flags |= LOCAL_TRUST_ACCOUNT;
128 break;
129 case 'i':
130 local_flags |= LOCAL_INTERDOM_ACCOUNT;
131 break;
132 case 'j':
133 d_printf("See 'net join' for this functionality\n");
134 exit(1);
135 break;
136 case 'n':
137 local_flags |= LOCAL_SET_NO_PASSWORD;
138 local_flags &= ~LOCAL_SET_PASSWORD;
139 SAFE_FREE(new_passwd);
140 new_passwd = smb_xstrdup("NO PASSWORD");
141 break;
142 case 'r':
143 remote_machine = optarg;
144 break;
145 case 's':
146 set_line_buffering(stdin);
147 set_line_buffering(stdout);
148 set_line_buffering(stderr);
149 stdin_passwd_get = True;
150 break;
151 case 'w':
152 local_flags |= LOCAL_SET_LDAP_ADMIN_PW;
153 fstrcpy(ldap_secret, optarg);
154 break;
155 case 'R':
156 lp_set_cmdline("name resolve order", optarg);
157 break;
158 case 'D':
159 lp_set_cmdline("log level", optarg);
160 break;
161 case 'U': {
162 got_username = True;
163 fstrcpy(user_name, optarg);
164 break;
165 case 'W':
166 local_flags |= LOCAL_SET_LDAP_ADMIN_PW;
167 *ldap_secret = '\0';
168 break;
169 }
170 case 'h':
171 default:
172 usage();
173 }
174 }
175
176 argc -= optind;
177 argv += optind;
178
179 switch(argc) {
180 case 0:
181 if (!got_username)
182 fstrcpy(user_name, "");
183 break;
184 case 1:
185 if (!(local_flags & LOCAL_AM_ROOT)) {
186 usage();
187 } else {
188 if (got_username) {
189 usage();
190 } else {
191 fstrcpy(user_name, argv[0]);
192 }
193 }
194 break;
195 default:
196 usage();
197 }
198
199 if (!lp_load_global(configfile)) {
200 fprintf(stderr, "Can't load %s - run testparm to debug it\n",
201 configfile);
202 exit(1);
203 }
204
205 return local_flags;
206 }
207
208 /*************************************************************
209 Utility function to prompt for new password.
210 *************************************************************/
211 static char *prompt_for_new_password(bool stdin_get)
212 {
213 char *p;
214 fstring new_pw;
215
216 ZERO_ARRAY(new_pw);
217
218 p = get_pass("New SMB password:", stdin_get);
219 if (p == NULL) {
220 return NULL;
221 }
222
223 fstrcpy(new_pw, p);
224 SAFE_FREE(p);
225
226 p = get_pass("Retype new SMB password:", stdin_get);
227 if (p == NULL) {
228 return NULL;
229 }
230
231 if (strcmp(p, new_pw)) {
232 fprintf(stderr, "Mismatch - password unchanged.\n");
233 ZERO_ARRAY(new_pw);
234 SAFE_FREE(p);
235 return NULL;
236 }
237
238 return p;
239 }
240
241
242 /*************************************************************
243 Change a password either locally or remotely.
244 *************************************************************/
245
246 static NTSTATUS password_change(const char *remote_mach,
247 const char *username,
248 const char *old_passwd, const char *new_pw,
249 int local_flags)
250 {
251 NTSTATUS ret;
252 char *err_str = NULL;
253 char *msg_str = NULL;
254
255 if (remote_mach != NULL) {
256 if (local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER|
257 LOCAL_DISABLE_USER|LOCAL_ENABLE_USER|
258 LOCAL_TRUST_ACCOUNT|LOCAL_SET_NO_PASSWORD)) {
259 /* these things can't be done remotely yet */
260 fprintf(stderr, "Invalid remote operation!\n");
261 return NT_STATUS_UNSUCCESSFUL;
262 }
263 ret = remote_password_change(remote_mach,
264 NULL, username,
265 old_passwd, new_pw, &err_str);
266 } else {
267 ret = local_password_change(username, local_flags, new_pw,
268 &err_str, &msg_str);
269 }
270
271 if (msg_str) {
272 printf("%s", msg_str);
273 }
274 if (err_str) {
275 fprintf(stderr, "%s", err_str);
276 }
277 if (!NT_STATUS_IS_OK(ret) && !err_str) {
278 fprintf(stderr, "Failed to change password!\n");
279 }
280
281 SAFE_FREE(msg_str);
282 SAFE_FREE(err_str);
283 return ret;
284 }
285
286 /*******************************************************************
287 Store the LDAP admin password in secrets.tdb
288 ******************************************************************/
289 static bool store_ldap_admin_pw (char* pw)
290 {
291 if (!pw)
292 return False;
293
294 if (!secrets_init())
295 return False;
296
297 return secrets_store_ldap_pw(lp_ldap_admin_dn(talloc_tos()), pw);
298 }
299
300
301 /*************************************************************
302 Handle password changing for root.
303 *************************************************************/
304
305 static int process_root(int local_flags)
306 {
307 struct passwd *pwd;
308 int result = 0;
309 char *old_passwd = NULL;
310
311 if (local_flags & LOCAL_SET_LDAP_ADMIN_PW) {
312 char *ldap_admin_dn = lp_ldap_admin_dn(talloc_tos());
313 if ( ! *ldap_admin_dn ) {
314 DEBUG(0,("ERROR: 'ldap admin dn' not defined! Please check your smb.conf\n"));
315 goto done;
316 }
317
318 printf("Setting stored password for \"%s\" in secrets.tdb\n", ldap_admin_dn);
319 if ( ! *ldap_secret ) {
320 new_passwd = prompt_for_new_password(stdin_passwd_get);
321 if (new_passwd == NULL) {
322 fprintf(stderr, "Failed to read new password!\n");
323 exit(1);
324 }
325 fstrcpy(ldap_secret, new_passwd);
326 }
327 if (!store_ldap_admin_pw(ldap_secret)) {
328 DEBUG(0,("ERROR: Failed to store the ldap admin password!\n"));
329 }
330 goto done;
331 }
332
333 /* Ensure passdb startup(). */
334 if(!initialize_password_db(False, NULL)) {
335 DEBUG(0, ("Failed to open passdb!\n"));
336 exit(1);
337 }
338
339 /* Ensure we have a SAM sid. */
340 get_global_sam_sid();
341
342 /*
343 * Ensure both add/delete user are not set
344 * Ensure add/delete user and either remote machine or join domain are
345 * not both set.
346 */
347 if(((local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER)) == (LOCAL_ADD_USER|LOCAL_DELETE_USER)) ||
348 ((local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER)) &&
349 (remote_machine != NULL))) {
350 usage();
351 }
352
353 /* Only load interfaces if we are doing network operations. */
354
355 if (remote_machine) {
356 load_interfaces();
357 }
358
359 if (!user_name[0] && (pwd = getpwuid_alloc(talloc_tos(), geteuid()))) {
360 fstrcpy(user_name, pwd->pw_name);
361 TALLOC_FREE(pwd);
362 }
363
364 if (!user_name[0]) {
365 fprintf(stderr,"You must specify a username\n");
366 exit(1);
367 }
368
369 if (local_flags & LOCAL_TRUST_ACCOUNT) {
370 /* add the $ automatically */
371 static fstring buf;
372
373 /*
374 * Remove any trailing '$' before we
375 * generate the initial machine password.
376 */
377
378 if (user_name[strlen(user_name)-1] == '$') {
379 user_name[strlen(user_name)-1] = 0;
380 }
381
382 if (local_flags & LOCAL_ADD_USER) {
383 SAFE_FREE(new_passwd);
384 new_passwd = smb_xstrdup(user_name);
385 if (!strlower_m(new_passwd)) {
386 fprintf(stderr, "strlower_m %s failed\n",
387 new_passwd);
388 exit(1);
389 }
390 }
391
392 /*
393 * Now ensure the username ends in '$' for
394 * the machine add.
395 */
396
397 slprintf(buf, sizeof(buf)-1, "%s$", user_name);
398 strlcpy(user_name, buf, sizeof(user_name));
399 } else if (local_flags & LOCAL_INTERDOM_ACCOUNT) {
400 static fstring buf;
401
402 if ((local_flags & LOCAL_ADD_USER) && (new_passwd == NULL)) {
403 /*
404 * Prompt for trusting domain's account password
405 */
406 new_passwd = prompt_for_new_password(stdin_passwd_get);
407 if(!new_passwd) {
408 fprintf(stderr, "Unable to get newpassword.\n");
409 exit(1);
410 }
411 }
412
413 /* prepare uppercased and '$' terminated username */
414 slprintf(buf, sizeof(buf) - 1, "%s$", user_name);
415 strlcpy(user_name, buf, sizeof(user_name));
416
417 } else {
418
419 if (remote_machine != NULL) {
420 old_passwd = get_pass("Old SMB password:",stdin_passwd_get);
421 if(!old_passwd) {
422 fprintf(stderr, "Unable to get old password.\n");
423 exit(1);
424 }
425 }
426
427 if (!(local_flags & LOCAL_SET_PASSWORD)) {
428
429 /*
430 * If we are trying to enable a user, first we need to find out
431 * if they are using a modern version of the smbpasswd file that
432 * disables a user by just writing a flag into the file. If so
433 * then we can re-enable a user without prompting for a new
434 * password. If not (ie. they have a no stored password in the
435 * smbpasswd file) then we need to prompt for a new password.
436 */
437
438 if(local_flags & LOCAL_ENABLE_USER) {
439 struct samu *sampass = NULL;
440
441 sampass = samu_new( NULL );
442 if (!sampass) {
443 fprintf(stderr, "talloc fail for struct samu.\n");
444 exit(1);
445 }
446 if (!pdb_getsampwnam(sampass, user_name)) {
447 fprintf(stderr, "Failed to find user %s in passdb backend.\n",
448 user_name );
449 exit(1);
450 }
451
452 if(pdb_get_nt_passwd(sampass) == NULL) {
453 local_flags |= LOCAL_SET_PASSWORD;
454 }
455 TALLOC_FREE(sampass);
456 }
457 }
458
459 if((local_flags & LOCAL_SET_PASSWORD) && (new_passwd == NULL)) {
460
461 new_passwd = prompt_for_new_password(stdin_passwd_get);
462 if(!new_passwd) {
463 fprintf(stderr, "Unable to get new password.\n");
464 exit(1);
465 }
466 }
467 }
468
469 if (!NT_STATUS_IS_OK(password_change(remote_machine, user_name,
470 old_passwd, new_passwd,
471 local_flags))) {
472 result = 1;
473 goto done;
474 }
475
476 if(remote_machine) {
477 printf("Password changed for user %s on %s.\n", user_name, remote_machine );
478 } else if(!(local_flags & (LOCAL_ADD_USER|LOCAL_DISABLE_USER|LOCAL_ENABLE_USER|LOCAL_DELETE_USER|LOCAL_SET_NO_PASSWORD|LOCAL_SET_PASSWORD))) {
479 struct samu *sampass = NULL;
480
481 sampass = samu_new( NULL );
482 if (!sampass) {
483 fprintf(stderr, "talloc fail for struct samu.\n");
484 exit(1);
485 }
486
487 if (!pdb_getsampwnam(sampass, user_name)) {
488 fprintf(stderr, "Failed to find user %s in passdb backend.\n",
489 user_name );
490 exit(1);
491 }
492
493 printf("Password changed for user %s.", user_name );
494 if(pdb_get_acct_ctrl(sampass)&ACB_DISABLED) {
495 printf(" User has disabled flag set.");
496 }
497 if(pdb_get_acct_ctrl(sampass) & ACB_PWNOTREQ) {
498 printf(" User has no password flag set.");
499 }
500 printf("\n");
501 TALLOC_FREE(sampass);
502 }
503
504 done:
505 SAFE_FREE(old_passwd);
506 SAFE_FREE(new_passwd);
507 return result;
508 }
509
510
511 /*************************************************************
512 Handle password changing for non-root.
513 *************************************************************/
514
515 static int process_nonroot(int local_flags)
516 {
517 struct passwd *pwd = NULL;
518 int result = 0;
519 char *old_pw = NULL;
520 char *new_pw = NULL;
521
522 if (local_flags & ~(LOCAL_AM_ROOT | LOCAL_SET_PASSWORD)) {
523 /* Extra flags that we can't honor non-root */
524 usage();
525 }
526
527 if (!user_name[0]) {
528 pwd = getpwuid_alloc(talloc_tos(), getuid());
529 if (pwd) {
530 fstrcpy(user_name,pwd->pw_name);
531 TALLOC_FREE(pwd);
532 } else {
533 fprintf(stderr, "smbpasswd: cannot lookup user name for uid %u\n", (unsigned int)getuid());
534 exit(1);
535 }
536 }
537
538 /*
539 * A non-root user is always setting a password
540 * via a remote machine (even if that machine is
541 * localhost).
542 */
543
544 load_interfaces(); /* Delayed from main() */
545
546 if (remote_machine == NULL) {
547 remote_machine = "127.0.0.1";
548 }
549
550 if (remote_machine != NULL) {
551 old_pw = get_pass("Old SMB password:",stdin_passwd_get);
552 if (old_pw == NULL) {
553 fprintf(stderr, "Unable to get old password.\n");
554 exit(1);
555 }
556 }
557
558 if (!new_passwd) {
559 new_pw = prompt_for_new_password(stdin_passwd_get);
560 }
561 else
562 new_pw = smb_xstrdup(new_passwd);
563
564 if (!new_pw) {
565 fprintf(stderr, "Unable to get new password.\n");
566 exit(1);
567 }
568
569 if (!NT_STATUS_IS_OK(password_change(remote_machine, user_name, old_pw,
570 new_pw, 0))) {
571 result = 1;
572 goto done;
573 }
574
575 printf("Password changed for user %s\n", user_name);
576
577 done:
578 SAFE_FREE(old_pw);
579 SAFE_FREE(new_pw);
580
581 return result;
582 }
583
584
585
586 /*********************************************************
587 Start here.
588 **********************************************************/
589 int main(int argc, char **argv)
590 {
591 TALLOC_CTX *frame = talloc_stackframe();
592 struct messaging_context *msg_ctx = NULL;
593 int local_flags = 0;
594 int ret;
595
596 #if defined(HAVE_SET_AUTH_PARAMETERS)
597 set_auth_parameters(argc, argv);
598 #endif /* HAVE_SET_AUTH_PARAMETERS */
599
600 if (getuid() == 0) {
601 local_flags = LOCAL_AM_ROOT;
602 }
603
604 smb_init_locale();
605
606 local_flags = process_options(argc, argv, local_flags);
607
608 setup_logging("smbpasswd", DEBUG_STDERR);
609
610 msg_ctx = server_messaging_context();
611 if (msg_ctx == NULL) {
612 if (geteuid() != 0) {
613 DBG_NOTICE("Unable to initialize messaging context. "
614 "Must be root to do that.\n");
615 } else {
616 fprintf(stderr,
617 "smbpasswd is not able to initialize the "
618 "messaging context!\n");
619 return 1;
620 }
621 }
622
623 /*
624 * Set the machine NETBIOS name if not already
625 * set from the config file.
626 */
627
628 if (!init_names())
629 return 1;
630
631 /* Check the effective uid - make sure we are not setuid */
632 if (is_setuid_root()) {
633 fprintf(stderr, "smbpasswd must *NOT* be setuid root.\n");
634 exit(1);
635 }
636
637 if (local_flags & LOCAL_AM_ROOT) {
638 bool ok;
639
640 ok = secrets_init();
641 if (!ok) {
642 return 1;
643 }
644 ret = process_root(local_flags);
645 } else {
646 ret = process_nonroot(local_flags);
647 }
648 TALLOC_FREE(frame);
649 return ret;
650 }
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