source3/utils/smbpasswd.c

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