source/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 2 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, write to the Free Software Foundation, Inc., 675
  18  * Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 #include "includes.h"
  21
  22 extern BOOL AllowDebugChange;
  23
  24 /*
  25  * Next two lines needed for SunOS and don't
  26  * hurt anything else...
  27  */
  28 extern char *optarg;
  29 extern int optind;
  30
  31 /* forced running in root-mode */
  32 static BOOL got_username = False;
  33 static BOOL stdin_passwd_get = False;
  34 static fstring user_name;
  35 static char *new_passwd = NULL;
  36 static const char *remote_machine = NULL;
  37
  38 static fstring ldap_secret;
  39
  40
  41 /*********************************************************
  42  Print command usage on stderr and die.
  43 **********************************************************/
  44 static void usage(void)
  45 {
  46         printf("When run by root:\n");
  47         printf("    smbpasswd [options] [username]\n");
  48         printf("otherwise:\n");
  49         printf("    smbpasswd [options]\n\n");
  50
  51         printf("options:\n");
  52         printf("  -L                   local mode (must be first option)\n");
  53         printf("  -h                   print this usage message\n");
  54         printf("  -s                   use stdin for password prompt\n");
  55         printf("  -c smb.conf file     Use the given path to the smb.conf file\n");
  56         printf("  -D LEVEL             debug level\n");
  57         printf("  -r MACHINE           remote machine\n");
  58         printf("  -U USER              remote username\n");
  59
  60         printf("extra options when run by root or in local mode:\n");
  61         printf("  -a                   add user\n");
  62         printf("  -d                   disable user\n");
  63         printf("  -e                   enable user\n");
  64         printf("  -i                   interdomain trust account\n");
  65         printf("  -m                   machine trust account\n");
  66         printf("  -n                   set no password\n");
  67         printf("  -W                   use stdin ldap admin password\n");
  68         printf("  -w PASSWORD          ldap admin password\n");
  69         printf("  -x                   delete user\n");
  70         printf("  -R ORDER             name resolve order\n");
  71
  72         exit(1);
  73 }
  74
  75 static void set_line_buffering(FILE *f)
  76 {
  77         setvbuf(f, NULL, _IOLBF, 0);
  78 }
  79
  80 /*******************************************************************
  81  Process command line options
  82  ******************************************************************/
  83
  84 static int process_options(int argc, char **argv, int local_flags)
  85 {
  86         int ch;
  87         pstring configfile;
  88         pstrcpy(configfile, dyn_CONFIGFILE);
  89
  90         local_flags |= LOCAL_SET_PASSWORD;
  91
  92         ZERO_STRUCT(user_name);
  93
  94         user_name[0] = '\0';
  95
  96         while ((ch = getopt(argc, argv, "c:axdehminjr:sw:R:D:U:LW")) != EOF) {
  97                 switch(ch) {
  98                 case 'L':
  99 #if !defined(DEVELOPER)
 100                         if (getuid() != 0) {
 101                                 fprintf(stderr, "smbpasswd -L can only be used by root.\n");
 102                                 exit(1);
 103                         }
 104 #endif
 105                         local_flags |= LOCAL_AM_ROOT;
 106                         break;
 107                 case 'c':
 108                         pstrcpy(configfile,optarg);
 109                         break;
 110                 case 'a':
 111                         local_flags |= LOCAL_ADD_USER;
 112                         break;
 113                 case 'x':
 114                         local_flags |= LOCAL_DELETE_USER;
 115                         local_flags &= ~LOCAL_SET_PASSWORD;
 116                         break;
 117                 case 'd':
 118                         local_flags |= LOCAL_DISABLE_USER;
 119                         local_flags &= ~LOCAL_SET_PASSWORD;
 120                         break;
 121                 case 'e':
 122                         local_flags |= LOCAL_ENABLE_USER;
 123                         local_flags &= ~LOCAL_SET_PASSWORD;
 124                         break;
 125                 case 'm':
 126                         local_flags |= LOCAL_TRUST_ACCOUNT;
 127                         break;
 128                 case 'i':
 129                         local_flags |= LOCAL_INTERDOM_ACCOUNT;
 130                         break;
 131                 case 'j':
 132                         d_printf("See 'net join' for this functionality\n");
 133                         exit(1);
 134                         break;
 135                 case 'n':
 136                         local_flags |= LOCAL_SET_NO_PASSWORD;
 137                         local_flags &= ~LOCAL_SET_PASSWORD;
 138                         new_passwd = smb_xstrdup("NO PASSWORD");
 139                         break;
 140                 case 'r':
 141                         remote_machine = optarg;
 142                         break;
 143                 case 's':
 144                         set_line_buffering(stdin);
 145                         set_line_buffering(stdout);
 146                         set_line_buffering(stderr);
 147                         stdin_passwd_get = True;
 148                         break;
 149                 case 'w':
 150                         local_flags |= LOCAL_SET_LDAP_ADMIN_PW;
 151                         fstrcpy(ldap_secret, optarg);
 152                         break;
 153                 case 'R':
 154                         lp_set_name_resolve_order(optarg);
 155                         break;
 156                 case 'D':
 157                         DEBUGLEVEL = atoi(optarg);
 158                         break;
 159                 case 'U': {
 160                         got_username = True;
 161                         fstrcpy(user_name, optarg);
 162                         break;
 163                 case 'W':
 164                         local_flags |= LOCAL_SET_LDAP_ADMIN_PW;
 165                         *ldap_secret = '\0';
 166                         break;
 167                 }
 168                 case 'h':
 169                 default:
 170                         usage();
 171                 }
 172         }
 173
 174         argc -= optind;
 175         argv += optind;
 176
 177         switch(argc) {
 178         case 0:
 179                 if (!got_username)
 180                         fstrcpy(user_name, "");
 181                 break;
 182         case 1:
 183                 if (!(local_flags & LOCAL_AM_ROOT)) {
 184                         usage();
 185                 } else {
 186                         if (got_username) {
 187                                 usage();
 188                         } else {
 189                                 fstrcpy(user_name, argv[0]);
 190                         }
 191                 }
 192                 break;
 193         default:
 194                 usage();
 195         }
 196
 197         if (!lp_load(configfile,True,False,False,True)) {
 198                 fprintf(stderr, "Can't load %s - run testparm to debug it\n",
 199                         configfile);
 200                 exit(1);
 201         }
 202
 203         return local_flags;
 204 }
 205
 206 /*************************************************************
 207  Utility function to prompt for new password.
 208 *************************************************************/
 209 static char *prompt_for_new_password(BOOL stdin_get)
 210 {
 211         char *p;
 212         fstring new_pw;
 213
 214         ZERO_ARRAY(new_pw);
 215
 216         p = get_pass("New SMB password:", stdin_get);
 217
 218         fstrcpy(new_pw, p);
 219         SAFE_FREE(p);
 220
 221         p = get_pass("Retype new SMB password:", stdin_get);
 222
 223         if (strcmp(p, new_pw)) {
 224                 fprintf(stderr, "Mismatch - password unchanged.\n");
 225                 ZERO_ARRAY(new_pw);
 226                 SAFE_FREE(p);
 227                 return NULL;
 228         }
 229
 230         return p;
 231 }
 232
 233
 234 /*************************************************************
 235  Change a password either locally or remotely.
 236 *************************************************************/
 237
 238 static NTSTATUS password_change(const char *remote_mach, char *username,
 239                                 char *old_passwd, char *new_pw,
 240                                 int local_flags)
 241 {
 242         NTSTATUS ret;
 243         pstring err_str;
 244         pstring msg_str;
 245
 246         if (remote_mach != NULL) {
 247                 if (local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER|LOCAL_DISABLE_USER|LOCAL_ENABLE_USER|
 248                                                         LOCAL_TRUST_ACCOUNT|LOCAL_SET_NO_PASSWORD)) {
 249                         /* these things can't be done remotely yet */
 250                         return NT_STATUS_UNSUCCESSFUL;
 251                 }
 252                 ret = remote_password_change(remote_mach, username,
 253                                              old_passwd, new_pw, err_str, sizeof(err_str));
 254                 if(*err_str)
 255                         fprintf(stderr, "%s", err_str);
 256                 return ret;
 257         }
 258
 259         ret = local_password_change(username, local_flags, new_pw,
 260                                      err_str, sizeof(err_str), msg_str, sizeof(msg_str));
 261
 262         if(*msg_str)
 263                 printf("%s", msg_str);
 264         if(*err_str)
 265                 fprintf(stderr, "%s", err_str);
 266
 267         return ret;
 268 }
 269
 270 /*******************************************************************
 271  Store the LDAP admin password in secrets.tdb
 272  ******************************************************************/
 273 static BOOL store_ldap_admin_pw (char* pw)
 274 {
 275         if (!pw)
 276                 return False;
 277
 278         if (!secrets_init())
 279                 return False;
 280
 281         return secrets_store_ldap_pw(lp_ldap_admin_dn(), pw);
 282 }
 283
 284
 285 /*************************************************************
 286  Handle password changing for root.
 287 *************************************************************/
 288
 289 static int process_root(int local_flags)
 290 {
 291         struct passwd  *pwd;
 292         int result = 0;
 293         char *old_passwd = NULL;
 294
 295         if (local_flags & LOCAL_SET_LDAP_ADMIN_PW) {
 296                 char *ldap_admin_dn = lp_ldap_admin_dn();
 297                 if ( ! *ldap_admin_dn ) {
 298                         DEBUG(0,("ERROR: 'ldap admin dn' not defined! Please check your smb.conf\n"));
 299                         goto done;
 300                 }
 301
 302                 printf("Setting stored password for \"%s\" in secrets.tdb\n", ldap_admin_dn);
 303                 if ( ! *ldap_secret ) {
 304                         new_passwd = prompt_for_new_password(stdin_passwd_get);
 305                         fstrcpy(ldap_secret, new_passwd);
 306                 }
 307                 if (!store_ldap_admin_pw(ldap_secret)) {
 308                         DEBUG(0,("ERROR: Failed to store the ldap admin password!\n"));
 309                 }
 310                 goto done;
 311         }
 312
 313         /* Ensure passdb startup(). */
 314         if(!initialize_password_db(False)) {
 315                 DEBUG(0, ("Failed to open passdb!\n"));
 316                 exit(1);
 317         }
 318
 319         /* Ensure we have a SAM sid. */
 320         get_global_sam_sid();
 321
 322         /*
 323          * Ensure both add/delete user are not set
 324          * Ensure add/delete user and either remote machine or join domain are
 325          * not both set.
 326          */
 327         if(((local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER)) == (LOCAL_ADD_USER|LOCAL_DELETE_USER)) ||
 328            ((local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER)) &&
 329                 (remote_machine != NULL))) {
 330                 usage();
 331         }
 332
 333         /* Only load interfaces if we are doing network operations. */
 334
 335         if (remote_machine) {
 336                 load_interfaces();
 337         }
 338
 339         if (!user_name[0] && (pwd = getpwuid_alloc(NULL, geteuid()))) {
 340                 fstrcpy(user_name, pwd->pw_name);
 341                 TALLOC_FREE(pwd);
 342         }
 343
 344         if (!user_name[0]) {
 345                 fprintf(stderr,"You must specify a username\n");
 346                 exit(1);
 347         }
 348
 349         if (local_flags & LOCAL_TRUST_ACCOUNT) {
 350                 /* add the $ automatically */
 351                 static fstring buf;
 352
 353                 /*
 354                  * Remove any trailing '$' before we
 355                  * generate the initial machine password.
 356                  */
 357
 358                 if (user_name[strlen(user_name)-1] == '$') {
 359                         user_name[strlen(user_name)-1] = 0;
 360                 }
 361
 362                 if (local_flags & LOCAL_ADD_USER) {
 363                         SAFE_FREE(new_passwd);
 364                         new_passwd = smb_xstrdup(user_name);
 365                         strlower_m(new_passwd);
 366                 }
 367
 368                 /*
 369                  * Now ensure the username ends in '$' for
 370                  * the machine add.
 371                  */
 372
 373                 slprintf(buf, sizeof(buf)-1, "%s$", user_name);
 374                 fstrcpy(user_name, buf);
 375         } else if (local_flags & LOCAL_INTERDOM_ACCOUNT) {
 376                 static fstring buf;
 377
 378                 if ((local_flags & LOCAL_ADD_USER) && (new_passwd == NULL)) {
 379                         /*
 380                          * Prompt for trusting domain's account password
 381                          */
 382                         new_passwd = prompt_for_new_password(stdin_passwd_get);
 383                         if(!new_passwd) {
 384                                 fprintf(stderr, "Unable to get newpassword.\n");
 385                                 exit(1);
 386                         }
 387                 }
 388
 389                 /* prepare uppercased and '$' terminated username */
 390                 slprintf(buf, sizeof(buf) - 1, "%s$", user_name);
 391                 fstrcpy(user_name, buf);
 392
 393         } else {
 394
 395                 if (remote_machine != NULL) {
 396                         old_passwd = get_pass("Old SMB password:",stdin_passwd_get);
 397                 }
 398
 399                 if (!(local_flags & LOCAL_SET_PASSWORD)) {
 400
 401                         /*
 402                          * If we are trying to enable a user, first we need to find out
 403                          * if they are using a modern version of the smbpasswd file that
 404                          * disables a user by just writing a flag into the file. If so
 405                          * then we can re-enable a user without prompting for a new
 406                          * password. If not (ie. they have a no stored password in the
 407                          * smbpasswd file) then we need to prompt for a new password.
 408                          */
 409
 410                         if(local_flags & LOCAL_ENABLE_USER) {
 411                                 struct samu *sampass = NULL;
 412
 413                                 sampass = samu_new( NULL );
 414                                 if (!sampass) {
 415                                         fprintf(stderr, "talloc fail for struct samu.\n");
 416                                         exit(1);
 417                                 }
 418                                 if (!pdb_getsampwnam(sampass, user_name)) {
 419                                         fprintf(stderr, "Failed to find user %s in passdb backend.\n",
 420                                                 user_name );
 421                                         exit(1);
 422                                 }
 423
 424                                 if(pdb_get_nt_passwd(sampass) == NULL) {
 425                                         local_flags |= LOCAL_SET_PASSWORD;
 426                                 }
 427                                 TALLOC_FREE(sampass);
 428                         }
 429                 }
 430
 431                 if((local_flags & LOCAL_SET_PASSWORD) && (new_passwd == NULL)) {
 432                         new_passwd = prompt_for_new_password(stdin_passwd_get);
 433
 434                         if(!new_passwd) {
 435                                 fprintf(stderr, "Unable to get new password.\n");
 436                                 exit(1);
 437                         }
 438                 }
 439         }
 440
 441         if (!NT_STATUS_IS_OK(password_change(remote_machine, user_name,
 442                                              old_passwd, new_passwd,
 443                                              local_flags))) {
 444                 fprintf(stderr,"Failed to modify password entry for user %s\n", user_name);
 445                 result = 1;
 446                 goto done;
 447         }
 448
 449         if(remote_machine) {
 450                 printf("Password changed for user %s on %s.\n", user_name, remote_machine );
 451         } else if(!(local_flags & (LOCAL_ADD_USER|LOCAL_DISABLE_USER|LOCAL_ENABLE_USER|LOCAL_DELETE_USER|LOCAL_SET_NO_PASSWORD|LOCAL_SET_PASSWORD))) {
 452                 struct samu *sampass = NULL;
 453
 454                 sampass = samu_new( NULL );
 455                 if (!sampass) {
 456                         fprintf(stderr, "talloc fail for struct samu.\n");
 457                         exit(1);
 458                 }
 459
 460                 if (!pdb_getsampwnam(sampass, user_name)) {
 461                         fprintf(stderr, "Failed to find user %s in passdb backend.\n",
 462                                 user_name );
 463                         exit(1);
 464                 }
 465
 466                 printf("Password changed for user %s.", user_name );
 467                 if(pdb_get_acct_ctrl(sampass)&ACB_DISABLED) {
 468                         printf(" User has disabled flag set.");
 469                 }
 470                 if(pdb_get_acct_ctrl(sampass) & ACB_PWNOTREQ) {
 471                         printf(" User has no password flag set.");
 472                 }
 473                 printf("\n");
 474                 TALLOC_FREE(sampass);
 475         }
 476
 477  done:
 478         SAFE_FREE(new_passwd);
 479         return result;
 480 }
 481
 482
 483 /*************************************************************
 484  Handle password changing for non-root.
 485 *************************************************************/
 486
 487 static int process_nonroot(int local_flags)
 488 {
 489         struct passwd  *pwd = NULL;
 490         int result = 0;
 491         char *old_pw = NULL;
 492         char *new_pw = NULL;
 493
 494         if (local_flags & ~(LOCAL_AM_ROOT | LOCAL_SET_PASSWORD)) {
 495                 /* Extra flags that we can't honor non-root */
 496                 usage();
 497         }
 498
 499         if (!user_name[0]) {
 500                 pwd = getpwuid_alloc(NULL, getuid());
 501                 if (pwd) {
 502                         fstrcpy(user_name,pwd->pw_name);
 503                         TALLOC_FREE(pwd);
 504                 } else {
 505                         fprintf(stderr, "smbpasswd: cannot lookup user name for uid %u\n", (unsigned int)getuid());
 506                         exit(1);
 507                 }
 508         }
 509
 510         /*
 511          * A non-root user is always setting a password
 512          * via a remote machine (even if that machine is
 513          * localhost).
 514          */
 515
 516         load_interfaces(); /* Delayed from main() */
 517
 518         if (remote_machine == NULL) {
 519                 remote_machine = "127.0.0.1";
 520         }
 521
 522         if (remote_machine != NULL) {
 523                 old_pw = get_pass("Old SMB password:",stdin_passwd_get);
 524         }
 525
 526         if (!new_passwd) {
 527                 new_pw = prompt_for_new_password(stdin_passwd_get);
 528         }
 529         else
 530                 new_pw = smb_xstrdup(new_passwd);
 531
 532         if (!new_pw) {
 533                 fprintf(stderr, "Unable to get new password.\n");
 534                 exit(1);
 535         }
 536
 537         if (!NT_STATUS_IS_OK(password_change(remote_machine, user_name, old_pw,
 538                                              new_pw, 0))) {
 539                 fprintf(stderr,"Failed to change password for %s\n", user_name);
 540                 result = 1;
 541                 goto done;
 542         }
 543
 544         printf("Password changed for user %s\n", user_name);
 545
 546  done:
 547         SAFE_FREE(old_pw);
 548         SAFE_FREE(new_pw);
 549
 550         return result;
 551 }
 552
 553
 554
 555 /*********************************************************
 556  Start here.
 557 **********************************************************/
 558 int main(int argc, char **argv)
 559 {
 560         int local_flags = 0;
 561
 562         AllowDebugChange = False;
 563
 564 #if defined(HAVE_SET_AUTH_PARAMETERS)
 565         set_auth_parameters(argc, argv);
 566 #endif /* HAVE_SET_AUTH_PARAMETERS */
 567
 568         if (getuid() == 0) {
 569                 local_flags = LOCAL_AM_ROOT;
 570         }
 571
 572         load_case_tables();
 573
 574         local_flags = process_options(argc, argv, local_flags);
 575
 576         setup_logging("smbpasswd", True);
 577
 578         /*
 579          * Set the machine NETBIOS name if not already
 580          * set from the config file.
 581          */
 582
 583         if (!init_names())
 584                 return 1;
 585
 586         /* Check the effective uid - make sure we are not setuid */
 587         if (is_setuid_root()) {
 588                 fprintf(stderr, "smbpasswd must *NOT* be setuid root.\n");
 589                 exit(1);
 590         }
 591
 592         if (local_flags & LOCAL_AM_ROOT) {
 593                 secrets_init();
 594                 return process_root(local_flags);
 595         }
 596
 597         return process_nonroot(local_flags);
 598 }